diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index c5781768164..cf4d6d4cd29 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -594,7 +594,7 @@
 @ stub __get_tlsindex
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -636,7 +636,7 @@
 @ cdecl __p__dstbias() MSVCRT___p__dstbias
 @ cdecl __p__environ() MSVCRT___p__environ
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__pctype() MSVCRT___p__pctype
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index 144ff1d197f..410aae44768 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -942,7 +942,7 @@
 @ stub __get_tlsindex
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -985,7 +985,7 @@
 @ cdecl __p__dstbias() MSVCRT___p__dstbias
 @ cdecl __p__environ() MSVCRT___p__environ
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__pctype() MSVCRT___p__pctype
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 469bc0100e9..171cfd27e18 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -932,7 +932,7 @@
 @ stub __get_tlsindex
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -975,7 +975,7 @@
 @ cdecl __p__dstbias() MSVCRT___p__dstbias
 @ cdecl __p__environ() MSVCRT___p__environ
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__pctype() MSVCRT___p__pctype
diff --git a/dlls/msvcr70/msvcr70.spec b/dlls/msvcr70/msvcr70.spec
index 06ced5e6aad..1fefdaa59b1 100644
--- a/dlls/msvcr70/msvcr70.spec
+++ b/dlls/msvcr70/msvcr70.spec
@@ -151,7 +151,7 @@
 @ cdecl __fpecode()
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -175,7 +175,7 @@
 @ cdecl __p__environ() MSVCRT___p__environ
 @ stub __p__fileinfo()
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__osver()
diff --git a/dlls/msvcr71/msvcr71.spec b/dlls/msvcr71/msvcr71.spec
index b5980b52be6..7f4f35acb0b 100644
--- a/dlls/msvcr71/msvcr71.spec
+++ b/dlls/msvcr71/msvcr71.spec
@@ -146,7 +146,7 @@
 @ cdecl __fpecode()
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -170,7 +170,7 @@
 @ cdecl __p__environ() MSVCRT___p__environ
 @ stub __p__fileinfo()
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__osver()
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 717d02a4cad..eb402490e1d 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -233,7 +233,7 @@
 @ stub __get_tlsindex
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -280,7 +280,7 @@
 @ cdecl __p__dstbias() MSVCRT___p__dstbias
 @ cdecl __p__environ() MSVCRT___p__environ
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ stub __p__osplatform
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 7a2ce051cfb..4050f423823 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -222,7 +222,7 @@
 @ stub __get_tlsindex
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -269,7 +269,7 @@
 @ cdecl __p__dstbias() MSVCRT___p__dstbias
 @ cdecl __p__environ() MSVCRT___p__environ
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__pctype() MSVCRT___p__pctype
diff --git a/dlls/msvcrt/file.c b/dlls/msvcrt/file.c
index 8f91ca9cfa4..b5b51fcca80 100644
--- a/dlls/msvcrt/file.c
+++ b/dlls/msvcrt/file.c
@@ -780,9 +780,10 @@ static int msvcrt_int_to_base32_w(int num, MSVCRT_wchar_t *str)
 }
 
 /*********************************************************************
- *		__p__iob  (MSVCRT.@)
+ *		__iob_func  (MSVCRT.@)
  */
-MSVCRT_FILE * CDECL __p__iob(void)
+#undef __iob_func
+MSVCRT_FILE * CDECL __iob_func(void)
 {
  return &MSVCRT__iob[0];
 }
diff --git a/dlls/msvcrt/iob.c b/dlls/msvcrt/iob.c
index c02913b45ab..5d289f6ba00 100644
--- a/dlls/msvcrt/iob.c
+++ b/dlls/msvcrt/iob.c
@@ -18,21 +18,22 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  */
 
-/* this function is part of the import lib for compatibility with the Mingw runtime */
+/* this function is part of the import lib for compatibility with ucrt runtime */
 #if 0
 #pragma makedep implib
 #endif
 
 #include "msvcrt.h"
 
-extern MSVCRT_FILE * CDECL __p__iob(void);
+#undef __iob_func
+extern MSVCRT_FILE * CDECL __iob_func(void);
 
 /*********************************************************************
  *		__acrt_iob_func(UCRTBASE.@)
  */
 MSVCRT_FILE * CDECL __acrt_iob_func(unsigned idx)
 {
-    return __p__iob() + idx;
+    return __iob_func() + idx;
 }
 
 #ifdef __i386__
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index ed1e72c5e1c..4ec0af12098 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -214,7 +214,7 @@
 @ stub __get_app_type
 @ cdecl __getmainargs(ptr ptr ptr long ptr)
 @ extern __initenv MSVCRT___initenv
-@ cdecl __iob_func() __p__iob
+@ cdecl __iob_func()
 @ cdecl __isascii(long) MSVCRT___isascii
 @ cdecl __iscsym(long) MSVCRT___iscsym
 @ cdecl __iscsymf(long) MSVCRT___iscsymf
@@ -259,7 +259,7 @@
 @ cdecl -arch=win32 __p__environ() MSVCRT___p__environ
 @ stub -arch=win32 __p__fileinfo()
 @ cdecl -arch=win32 __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub -arch=win32 __p__mbcasemap()
 @ cdecl -arch=win32 __p__mbctype()
 @ cdecl -arch=win32 __p__osver()
diff --git a/dlls/msvcrtd/msvcrtd.spec b/dlls/msvcrtd/msvcrtd.spec
index debd4d01d65..4a0238e3e9a 100644
--- a/dlls/msvcrtd/msvcrtd.spec
+++ b/dlls/msvcrtd/msvcrtd.spec
@@ -167,7 +167,7 @@
 @ cdecl __p__environ() MSVCRT___p__environ
 @ stub __p__fileinfo()
 @ cdecl __p__fmode() MSVCRT___p__fmode
-@ cdecl __p__iob()
+@ cdecl __p__iob() __iob_func
 @ stub __p__mbcasemap()
 @ cdecl __p__mbctype()
 @ cdecl __p__osver()