diff --git a/dlls/crtdll/Makefile.in b/dlls/crtdll/Makefile.in
index 6b11e70875f..1320db4d01d 100644
--- a/dlls/crtdll/Makefile.in
+++ b/dlls/crtdll/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=0 -D_CRTDLL
+EXTRADEFS = -D_MSVCR_VER=0 -D_CRTDLL
 MODULE    = crtdll.dll
 PARENTSRC = ../msvcrt
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr100/Makefile.in b/dlls/msvcr100/Makefile.in
index 2b03eeb397a..44ed7ad6add 100644
--- a/dlls/msvcr100/Makefile.in
+++ b/dlls/msvcr100/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=100
+EXTRADEFS = -D_MSVCR_VER=100
 MODULE    = msvcr100.dll
 IMPORTLIB = msvcr100
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr110/Makefile.in b/dlls/msvcr110/Makefile.in
index cfcb9f62e7f..6ad9db7e07a 100644
--- a/dlls/msvcr110/Makefile.in
+++ b/dlls/msvcr110/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=110
+EXTRADEFS = -D_MSVCR_VER=110
 MODULE    = msvcr110.dll
 IMPORTLIB = msvcr110
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr120/Makefile.in b/dlls/msvcr120/Makefile.in
index 8d1ee347745..22db2059b5c 100644
--- a/dlls/msvcr120/Makefile.in
+++ b/dlls/msvcr120/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=120
+EXTRADEFS = -D_MSVCR_VER=120
 MODULE    = msvcr120.dll
 IMPORTLIB = msvcr120
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr70/Makefile.in b/dlls/msvcr70/Makefile.in
index 8425a6855d3..9fd9f81d259 100644
--- a/dlls/msvcr70/Makefile.in
+++ b/dlls/msvcr70/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=70
+EXTRADEFS = -D_MSVCR_VER=70
 MODULE    = msvcr70.dll
 IMPORTLIB = msvcr70
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr71/Makefile.in b/dlls/msvcr71/Makefile.in
index 706160cebd5..26ffc2385b6 100644
--- a/dlls/msvcr71/Makefile.in
+++ b/dlls/msvcr71/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=71
+EXTRADEFS = -D_MSVCR_VER=71
 MODULE    = msvcr71.dll
 IMPORTLIB = msvcr71
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr80/Makefile.in b/dlls/msvcr80/Makefile.in
index 4cd1fd6f150..84b7dfddaaf 100644
--- a/dlls/msvcr80/Makefile.in
+++ b/dlls/msvcr80/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=80
+EXTRADEFS = -D_MSVCR_VER=80
 MODULE    = msvcr80.dll
 IMPORTLIB = msvcr80
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcr90/Makefile.in b/dlls/msvcr90/Makefile.in
index 566eb0f36c7..ab7960854fc 100644
--- a/dlls/msvcr90/Makefile.in
+++ b/dlls/msvcr90/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=90
+EXTRADEFS = -D_MSVCR_VER=90
 MODULE    = msvcr90.dll
 IMPORTLIB = msvcr90
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcrt/Makefile.in b/dlls/msvcrt/Makefile.in
index c7b3a9f7ab7..35615d2c337 100644
--- a/dlls/msvcrt/Makefile.in
+++ b/dlls/msvcrt/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=0
+EXTRADEFS = -D_MSVCR_VER=0
 MODULE    = msvcrt.dll
 IMPORTLIB = msvcrt
 DELAYIMPORTS = advapi32 user32
diff --git a/dlls/msvcrt/console.c b/dlls/msvcrt/console.c
index 3ad79eec3a5..9bf5e56b8dd 100644
--- a/dlls/msvcrt/console.c
+++ b/dlls/msvcrt/console.c
@@ -32,8 +32,8 @@ WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
 
 /* MT */
-#define LOCK_CONSOLE   _mlock(_CONIO_LOCK)
-#define UNLOCK_CONSOLE _munlock(_CONIO_LOCK)
+#define LOCK_CONSOLE   _lock(_CONIO_LOCK)
+#define UNLOCK_CONSOLE _unlock(_CONIO_LOCK)
 
 static HANDLE MSVCRT_console_in = INVALID_HANDLE_VALUE;
 static HANDLE MSVCRT_console_out= INVALID_HANDLE_VALUE;
diff --git a/dlls/msvcrt/exit.c b/dlls/msvcrt/exit.c
index cb38b35de9a..fbe1e5d533e 100644
--- a/dlls/msvcrt/exit.c
+++ b/dlls/msvcrt/exit.c
@@ -26,8 +26,8 @@
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
 /* MT */
-#define LOCK_EXIT   _mlock(_EXIT_LOCK1)
-#define UNLOCK_EXIT _munlock(_EXIT_LOCK1)
+#define LOCK_EXIT   _lock(_EXIT_LOCK1)
+#define UNLOCK_EXIT _unlock(_EXIT_LOCK1)
 
 static MSVCRT_purecall_handler purecall_handler = NULL;
 
diff --git a/dlls/msvcrt/heap.c b/dlls/msvcrt/heap.c
index 31153fa5b18..7c7a8d25033 100644
--- a/dlls/msvcrt/heap.c
+++ b/dlls/msvcrt/heap.c
@@ -29,8 +29,8 @@
 WINE_DEFAULT_DEBUG_CHANNEL(msvcrt);
 
 /* MT */
-#define LOCK_HEAP   _mlock( _HEAP_LOCK )
-#define UNLOCK_HEAP _munlock( _HEAP_LOCK )
+#define LOCK_HEAP   _lock( _HEAP_LOCK )
+#define UNLOCK_HEAP _unlock( _HEAP_LOCK )
 
 /* _aligned */
 #define SAVED_PTR(x) ((void *)((DWORD_PTR)((char *)x - sizeof(void *)) & \
diff --git a/dlls/msvcrt/locale.c b/dlls/msvcrt/locale.c
index dd9a7ce0930..5c7999cfef1 100644
--- a/dlls/msvcrt/locale.c
+++ b/dlls/msvcrt/locale.c
@@ -1122,7 +1122,7 @@ void free_mbcinfo(MSVCRT_pthreadmbcinfo mbcinfo)
  */
 void CDECL _lock_locales(void)
 {
-    _mlock(_SETLOCALE_LOCK);
+    _lock(_SETLOCALE_LOCK);
 }
 
 /*********************************************************************
@@ -1130,7 +1130,7 @@ void CDECL _lock_locales(void)
  */
 void CDECL _unlock_locales(void)
 {
-    _munlock(_SETLOCALE_LOCK);
+    _unlock(_SETLOCALE_LOCK);
 }
 
 MSVCRT__locale_t CDECL get_current_locale_noalloc(MSVCRT__locale_t locale)
diff --git a/dlls/msvcrt/mtdll.h b/dlls/msvcrt/mtdll.h
index c01beaff93c..87eebd97dd4 100644
--- a/dlls/msvcrt/mtdll.h
+++ b/dlls/msvcrt/mtdll.h
@@ -19,22 +19,9 @@
 #ifndef WINE_MTDLL_H
 #define WINE_MTDLL_H
 
-#if defined(_MT)
-
-#define _mlock(locknum)   _lock(locknum)
-#define _munlock(locknum) _unlock(locknum)
-
 void __cdecl _unlock( int locknum );
 void __cdecl _lock( int locknum );
 
-#else
-
-#define _mlock(locknum)   do {} while(0)
-#define _munlock(locknum) do {} while(0)
-
-#endif
-
-
 #define _SIGNAL_LOCK    1
 #define _IOB_SCAN_LOCK  2
 #define _TMPNAM_LOCK    3
diff --git a/dlls/msvcrt/onexit.c b/dlls/msvcrt/onexit.c
index 18b935b88d9..c3537eaf117 100644
--- a/dlls/msvcrt/onexit.c
+++ b/dlls/msvcrt/onexit.c
@@ -51,13 +51,13 @@ int __cdecl _register_onexit_function(_onexit_table_t *table, _onexit_t func)
     if (!table)
         return -1;
 
-    _mlock(_EXIT_LOCK1);
+    _lock(_EXIT_LOCK1);
     if (!table->_first)
     {
         table->_first = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, 32 * sizeof(void *));
         if (!table->_first)
         {
-            _munlock(_EXIT_LOCK1);
+            _unlock(_EXIT_LOCK1);
             return -1;
         }
         table->_last = table->_first;
@@ -71,7 +71,7 @@ int __cdecl _register_onexit_function(_onexit_table_t *table, _onexit_t func)
         _PVFV *tmp = HeapReAlloc(GetProcessHeap(), 0, table->_first, 2 * len * sizeof(void *));
         if (!tmp)
         {
-            _munlock(_EXIT_LOCK1);
+            _unlock(_EXIT_LOCK1);
             return -1;
         }
         table->_first = tmp;
@@ -81,7 +81,7 @@ int __cdecl _register_onexit_function(_onexit_table_t *table, _onexit_t func)
 
     *table->_last = (_PVFV)func;
     table->_last++;
-    _munlock(_EXIT_LOCK1);
+    _unlock(_EXIT_LOCK1);
     return 0;
 }
 
@@ -97,10 +97,10 @@ int __cdecl _execute_onexit_table(_onexit_table_t *table)
     if (!table)
         return -1;
 
-    _mlock(_EXIT_LOCK1);
+    _lock(_EXIT_LOCK1);
     if (!table->_first || table->_first >= table->_last)
     {
-        _munlock(_EXIT_LOCK1);
+        _unlock(_EXIT_LOCK1);
         return 0;
     }
     copy._first = table->_first;
@@ -108,7 +108,7 @@ int __cdecl _execute_onexit_table(_onexit_table_t *table)
     copy._end   = table->_end;
     memset(table, 0, sizeof(*table));
     _initialize_onexit_table(table);
-    _munlock(_EXIT_LOCK1);
+    _unlock(_EXIT_LOCK1);
 
     for (func = copy._last - 1; func >= copy._first; func--)
     {
diff --git a/dlls/msvcrt/process.c b/dlls/msvcrt/process.c
index 82f1a1ac594..fe33a99998f 100644
--- a/dlls/msvcrt/process.c
+++ b/dlls/msvcrt/process.c
@@ -1083,7 +1083,7 @@ MSVCRT_FILE* CDECL MSVCRT__wpopen(const MSVCRT_wchar_t* command, const MSVCRT_wc
   fdToDup = readPipe ? 1 : 0;
   fdToOpen = readPipe ? 0 : 1;
 
-  _mlock(_POPEN_LOCK);
+  _lock(_POPEN_LOCK);
   for(i=0; i<popen_handles_size; i++)
   {
     if (!popen_handles[i].f)
@@ -1135,7 +1135,7 @@ MSVCRT_FILE* CDECL MSVCRT__wpopen(const MSVCRT_wchar_t* command, const MSVCRT_wc
       MSVCRT__close(fds[fdToOpen]);
     container->f = ret;
   }
-  _munlock(_POPEN_LOCK);
+  _unlock(_POPEN_LOCK);
   HeapFree(GetProcessHeap(), 0, comspec);
   HeapFree(GetProcessHeap(), 0, fullcmd);
   MSVCRT__dup2(fdStdHandle, fdToDup);
@@ -1143,7 +1143,7 @@ MSVCRT_FILE* CDECL MSVCRT__wpopen(const MSVCRT_wchar_t* command, const MSVCRT_wc
   return ret;
 
 error:
-  _munlock(_POPEN_LOCK);
+  _unlock(_POPEN_LOCK);
   if (fdStdHandle != -1) MSVCRT__close(fdStdHandle);
   MSVCRT__close(fds[0]);
   MSVCRT__close(fds[1]);
@@ -1187,7 +1187,7 @@ int CDECL MSVCRT__pclose(MSVCRT_FILE* file)
 
   if (!MSVCRT_CHECK_PMT(file != NULL)) return -1;
 
-  _mlock(_POPEN_LOCK);
+  _lock(_POPEN_LOCK);
   for(i=0; i<popen_handles_size; i++)
   {
     if (popen_handles[i].f == file)
@@ -1195,14 +1195,14 @@ int CDECL MSVCRT__pclose(MSVCRT_FILE* file)
   }
   if(i == popen_handles_size)
   {
-    _munlock(_POPEN_LOCK);
+    _unlock(_POPEN_LOCK);
     *MSVCRT__errno() = MSVCRT_EBADF;
     return -1;
   }
 
   h = popen_handles[i].proc;
   popen_handles[i].f = NULL;
-  _munlock(_POPEN_LOCK);
+  _unlock(_POPEN_LOCK);
 
   MSVCRT_fclose(file);
   if(WaitForSingleObject(h, INFINITE)==WAIT_FAILED || !GetExitCodeProcess(h, &i))
diff --git a/dlls/msvcrt/time.c b/dlls/msvcrt/time.c
index 702aaa8166f..adf57104317 100644
--- a/dlls/msvcrt/time.c
+++ b/dlls/msvcrt/time.c
@@ -111,7 +111,7 @@ void CDECL MSVCRT__tzset(void)
     char *tz = MSVCRT_getenv("TZ");
     BOOL error;
 
-    _mlock(_TIME_LOCK);
+    _lock(_TIME_LOCK);
     if(tz && tz[0]) {
         BOOL neg_zone = FALSE;
 
@@ -158,7 +158,7 @@ void CDECL MSVCRT__tzset(void)
                     sizeof(tzname_dst), NULL, &error) || error)
             *MSVCRT__tzname[0] = 0;
     }
-    _munlock(_TIME_LOCK);
+    _unlock(_TIME_LOCK);
 }
 
 static void _tzset_init(void)
@@ -166,12 +166,12 @@ static void _tzset_init(void)
     static BOOL init = FALSE;
 
     if(!init) {
-        _mlock(_TIME_LOCK);
+        _lock(_TIME_LOCK);
         if(!init) {
             MSVCRT__tzset();
             init = TRUE;
         }
-        _munlock(_TIME_LOCK);
+        _unlock(_TIME_LOCK);
     }
 }
 
diff --git a/dlls/msvcrtd/Makefile.in b/dlls/msvcrtd/Makefile.in
index 44f89206bae..922aa7f4340 100644
--- a/dlls/msvcrtd/Makefile.in
+++ b/dlls/msvcrtd/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=0
+EXTRADEFS = -D_MSVCR_VER=0
 MODULE    = msvcrtd.dll
 IMPORTLIB = msvcrtd
 PARENTSRC = ../msvcrt
diff --git a/dlls/ucrtbase/Makefile.in b/dlls/ucrtbase/Makefile.in
index bd72f153eff..0847339c217 100644
--- a/dlls/ucrtbase/Makefile.in
+++ b/dlls/ucrtbase/Makefile.in
@@ -1,4 +1,4 @@
-EXTRADEFS = -D_MT -D_MSVCR_VER=140
+EXTRADEFS = -D_MSVCR_VER=140
 MODULE    = ucrtbase.dll
 IMPORTLIB = ucrtbase
 DELAYIMPORTS = advapi32 user32