diff --git a/dlls/crtdll/crtdll.spec b/dlls/crtdll/crtdll.spec
index 3ff526d4bea..9b641cdf4a5 100644
--- a/dlls/crtdll/crtdll.spec
+++ b/dlls/crtdll/crtdll.spec
@@ -434,7 +434,7 @@
 @ cdecl -arch=win64 localtime(ptr) _localtime64
 @ cdecl log(double)
 @ cdecl log10(double)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbstowcs(ptr str long)
diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 830262992c0..68e502af597 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -1054,7 +1054,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -1739,7 +1739,7 @@
 @ cdecl -arch=!i386 logf(float)
 @ cdecl log10(double)
 @ cdecl -arch=!i386 log10f(float)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbrlen(ptr long ptr)
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index 226fe67ebb3..560002e59ed 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -1411,7 +1411,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -2097,7 +2097,7 @@
 @ cdecl -arch=!i386 logf(float)
 @ cdecl log10(double)
 @ cdecl -arch=!i386 log10f(float)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbrlen(ptr long ptr)
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 08ebd4f25bf..46715817932 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -1422,7 +1422,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -2269,7 +2269,7 @@
 @ cdecl logb(double)
 @ cdecl logbf(float)
 @ cdecl logbl(double) logb
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl lrint(double)
 @ cdecl lrintf(float)
 @ cdecl lrintl(double) lrint
diff --git a/dlls/msvcr70/msvcr70.spec b/dlls/msvcr70/msvcr70.spec
index 4866d80d9a0..6d74bcb96f4 100644
--- a/dlls/msvcr70/msvcr70.spec
+++ b/dlls/msvcr70/msvcr70.spec
@@ -409,7 +409,7 @@
 @ cdecl _lock(long)
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -780,7 +780,7 @@
 @ cdecl -arch=win64 localtime(ptr) _localtime64
 @ cdecl log(double)
 @ cdecl log10(double)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbstowcs(ptr str long)
diff --git a/dlls/msvcr71/msvcr71.spec b/dlls/msvcr71/msvcr71.spec
index 58da28a2029..4b76581f477 100644
--- a/dlls/msvcr71/msvcr71.spec
+++ b/dlls/msvcr71/msvcr71.spec
@@ -404,7 +404,7 @@
 @ cdecl _lock(long)
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -776,7 +776,7 @@
 @ cdecl -arch=win64 localtime(ptr) _localtime64
 @ cdecl log(double)
 @ cdecl log10(double)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbstowcs(ptr str long)
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index b2337998460..6cce6ee22ee 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -726,7 +726,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -1420,7 +1420,7 @@
 @ cdecl -arch=!i386 logf(float)
 @ cdecl log10(double)
 @ cdecl -arch=!i386 log10f(float)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbrlen(ptr long ptr)
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 10aa7dca748..ca22d7460be 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -704,7 +704,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -1392,7 +1392,7 @@
 @ cdecl log10(double)
 @ cdecl -arch=!i386 log10f(float)
 @ cdecl -arch=!i386 logf(float)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbrlen(ptr long ptr)
diff --git a/dlls/msvcrt/except_arm.c b/dlls/msvcrt/except_arm.c
index 7d519273c34..a79cbe63c44 100644
--- a/dlls/msvcrt/except_arm.c
+++ b/dlls/msvcrt/except_arm.c
@@ -105,27 +105,6 @@ unsigned int CDECL __CxxQueryExceptionSize(void)
 }
 
 
-/*******************************************************************
- *		longjmp (MSVCRT.@)
- */
-void __cdecl MSVCRT_longjmp(_JUMP_BUFFER *jmp, int retval)
-{
-    EXCEPTION_RECORD rec;
-
-    if (!retval) retval = 1;
-    if (jmp->Frame)
-    {
-        rec.ExceptionCode = STATUS_LONGJUMP;
-        rec.ExceptionFlags = 0;
-        rec.ExceptionRecord = NULL;
-        rec.ExceptionAddress = NULL;
-        rec.NumberParameters = 1;
-        rec.ExceptionInformation[0] = (DWORD_PTR)jmp;
-        RtlUnwind((void *)jmp->Frame, (void *)jmp->Pc, &rec, IntToPtr(retval));
-    }
-    __wine_longjmp( (__wine_jmp_buf *)jmp, retval );
-}
-
 /*********************************************************************
  *              _fpieee_flt (MSVCRT.@)
  */
diff --git a/dlls/msvcrt/except_arm64.c b/dlls/msvcrt/except_arm64.c
index 96144ec2c45..793c71f3251 100644
--- a/dlls/msvcrt/except_arm64.c
+++ b/dlls/msvcrt/except_arm64.c
@@ -111,26 +111,6 @@ unsigned int CDECL __CxxQueryExceptionSize(void)
  */
 __ASM_GLOBAL_FUNC( _setjmp, "b _setjmpex" );
 
-/*******************************************************************
- *		longjmp (MSVCRT.@)
- */
-void __cdecl MSVCRT_longjmp(_JUMP_BUFFER *jmp, int retval)
-{
-    EXCEPTION_RECORD rec;
-
-    if (!retval) retval = 1;
-    if (jmp->Frame)
-    {
-        rec.ExceptionCode = STATUS_LONGJUMP;
-        rec.ExceptionFlags = 0;
-        rec.ExceptionRecord = NULL;
-        rec.ExceptionAddress = NULL;
-        rec.NumberParameters = 1;
-        rec.ExceptionInformation[0] = (DWORD_PTR)jmp;
-        RtlUnwind((void *)jmp->Frame, (void *)jmp->Lr, &rec, IntToPtr(retval));
-    }
-    __wine_longjmp( (__wine_jmp_buf *)jmp, retval );
-}
 
 /*********************************************************************
  *              _fpieee_flt (MSVCRT.@)
diff --git a/dlls/msvcrt/except_arm64ec.c b/dlls/msvcrt/except_arm64ec.c
index fe7b7a048be..d9ea54c4d1c 100644
--- a/dlls/msvcrt/except_arm64ec.c
+++ b/dlls/msvcrt/except_arm64ec.c
@@ -105,27 +105,6 @@ unsigned int CDECL __CxxQueryExceptionSize(void)
 }
 
 
-/*******************************************************************
- *		longjmp (MSVCRT.@)
- */
-void __cdecl MSVCRT_longjmp( _JUMP_BUFFER *jmp, int retval )
-{
-    EXCEPTION_RECORD rec;
-
-    if (!retval) retval = 1;
-    if (jmp->Frame)
-    {
-        rec.ExceptionCode = STATUS_LONGJUMP;
-        rec.ExceptionFlags = 0;
-        rec.ExceptionRecord = NULL;
-        rec.ExceptionAddress = NULL;
-        rec.NumberParameters = 1;
-        rec.ExceptionInformation[0] = (DWORD_PTR)jmp;
-        RtlUnwind( (void *)jmp->Frame, (void *)jmp->Rip, &rec, IntToPtr(retval) );
-    }
-    __wine_longjmp( (__wine_jmp_buf *)jmp, retval );
-}
-
 /*********************************************************************
  *              _fpieee_flt (MSVCRT.@)
  */
diff --git a/dlls/msvcrt/except_i386.c b/dlls/msvcrt/except_i386.c
index 1c302158c10..283c02638d8 100644
--- a/dlls/msvcrt/except_i386.c
+++ b/dlls/msvcrt/except_i386.c
@@ -27,9 +27,11 @@
 
 #ifdef __i386__
 
-#include <setjmp.h>
 #include <stdarg.h>
 #include <fpieee.h>
+#define longjmp ms_longjmp  /* avoid prototype mismatch */
+#include <setjmp.h>
+#undef longjmp
 
 #include "windef.h"
 #include "winbase.h"
@@ -1074,7 +1076,7 @@ int WINAPIV __regs__setjmp3(_JUMP_BUFFER *jmp, int nb_args, ...)
 /*********************************************************************
  *		longjmp (MSVCRT.@)
  */
-void CDECL MSVCRT_longjmp(_JUMP_BUFFER *jmp, int retval)
+void __cdecl longjmp(_JUMP_BUFFER *jmp, int retval)
 {
     unsigned long cur_frame = 0;
 
diff --git a/dlls/msvcrt/except_x86_64.c b/dlls/msvcrt/except_x86_64.c
index e1062360212..3a2e13b3082 100644
--- a/dlls/msvcrt/except_x86_64.c
+++ b/dlls/msvcrt/except_x86_64.c
@@ -20,9 +20,11 @@
 
 #if defined(__x86_64__) && !defined(__arm64ec__)
 
-#include <setjmp.h>
 #include <stdarg.h>
 #include <fpieee.h>
+#define longjmp ms_longjmp  /* avoid prototype mismatch */
+#include <setjmp.h>
+#undef longjmp
 
 #include "ntstatus.h"
 #define WIN32_NO_STATUS
@@ -700,7 +702,8 @@ unsigned int CDECL __CxxQueryExceptionSize(void)
 /*******************************************************************
  *		longjmp (MSVCRT.@)
  */
-void __cdecl MSVCRT_longjmp( _JUMP_BUFFER *jmp, int retval )
+#ifndef __WINE_PE_BUILD
+void __cdecl longjmp( _JUMP_BUFFER *jmp, int retval )
 {
     EXCEPTION_RECORD rec;
 
@@ -717,6 +720,7 @@ void __cdecl MSVCRT_longjmp( _JUMP_BUFFER *jmp, int retval )
     }
     __wine_longjmp( (__wine_jmp_buf *)jmp, retval );
 }
+#endif
 
 /*******************************************************************
  *		_local_unwind (MSVCRT.@)
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 42fd1b57b71..ec5dabebe1f 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -672,7 +672,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -1368,7 +1368,7 @@
 @ cdecl log10(double)
 @ cdecl -arch=!i386 logf(float)
 @ cdecl -arch=!i386 log10f(float)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbrlen(ptr long ptr)
diff --git a/dlls/msvcrtd/msvcrtd.spec b/dlls/msvcrtd/msvcrtd.spec
index e22d5b0102f..0c0f8570fbc 100644
--- a/dlls/msvcrtd/msvcrtd.spec
+++ b/dlls/msvcrtd/msvcrtd.spec
@@ -386,7 +386,7 @@
 @ cdecl _lock(long)
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -733,7 +733,7 @@
 @ cdecl -arch=win64 localtime(ptr) _localtime64
 @ cdecl log(double)
 @ cdecl log10(double)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl malloc(long)
 @ cdecl mblen(ptr long)
 @ cdecl mbstowcs(ptr str long)
diff --git a/dlls/ucrtbase/ucrtbase.spec b/dlls/ucrtbase/ucrtbase.spec
index b37bcbe7bf4..449b734ad34 100644
--- a/dlls/ucrtbase/ucrtbase.spec
+++ b/dlls/ucrtbase/ucrtbase.spec
@@ -570,7 +570,7 @@
 @ cdecl _locking(long long long)
 @ cdecl _logb(double) logb
 @ cdecl -arch=!i386 _logbf(float) logbf
-@ cdecl -arch=i386 _longjmpex(ptr long) MSVCRT_longjmp
+@ cdecl -arch=i386 _longjmpex(ptr long) longjmp
 @ cdecl _lrotl(long long) MSVCRT__lrotl
 @ cdecl _lrotr(long long) MSVCRT__lrotr
 @ cdecl _lsearch(ptr ptr ptr long ptr)
@@ -2405,7 +2405,7 @@
 @ cdecl logbf(float)
 @ cdecl logbl(double) logb
 @ cdecl -arch=!i386 logf(float)
-@ cdecl longjmp(ptr long) MSVCRT_longjmp
+@ cdecl longjmp(ptr long)
 @ cdecl lrint(double)
 @ cdecl lrintf(float)
 @ cdecl lrintl(double) lrint