diff --git a/dll/win32/msvcrt20/msvcrt20.c b/dll/win32/msvcrt20/msvcrt20.c
index 0bda9aa8172..8d1a6eca4e8 100644
--- a/dll/win32/msvcrt20/msvcrt20.c
+++ b/dll/win32/msvcrt20/msvcrt20.c
@@ -53,6 +53,8 @@ extern char** __initenv;     /* pointer to initial environment block */
 extern wchar_t** _wenviron;  /* pointer to environment block */
 extern wchar_t** __winitenv; /* pointer to initial environment block */
 
+
+extern BOOL msvcrt_init_heap(void);
 extern void CDECL __getmainargs(int *argc, char** *argv, char** *envp,
                                 int expand_wildcards, int *new_mode);
 extern void CDECL __wgetmainargs(int *argc, WCHAR** *wargv, WCHAR** *wenvp,
@@ -82,6 +84,9 @@ DllMain(PVOID hinstDll, ULONG dwReason, PVOID reserved)
         if (!msvcrt_init_tls())
           return FALSE;
 
+        if (!msvcrt_init_heap())
+            return FALSE;
+
         if (BlockEnvToEnvironA() < 0)
             return FALSE;
 
diff --git a/dll/win32/msvcrt40/msvcrt40.c b/dll/win32/msvcrt40/msvcrt40.c
index 1509cf3cd4a..3c015094782 100644
--- a/dll/win32/msvcrt40/msvcrt40.c
+++ b/dll/win32/msvcrt40/msvcrt40.c
@@ -54,6 +54,8 @@ extern char** __initenv;     /* pointer to initial environment block */
 extern wchar_t** _wenviron;  /* pointer to environment block */
 extern wchar_t** __winitenv; /* pointer to initial environment block */
 
+extern BOOL msvcrt_init_heap(void);
+
 /* LIBRARY ENTRY POINT ********************************************************/
 
 BOOL
@@ -78,6 +80,9 @@ DllMain(PVOID hinstDll, ULONG dwReason, PVOID reserved)
         if (!msvcrt_init_tls())
           return FALSE;
 
+        if (!msvcrt_init_heap())
+            return FALSE;
+
         if (BlockEnvToEnvironA() < 0)
             return FALSE;