diff --git a/dlls/msvcp90/locale.c b/dlls/msvcp90/locale.c
index 7b848744250..9293e0c9ac6 100644
--- a/dlls/msvcp90/locale.c
+++ b/dlls/msvcp90/locale.c
@@ -55,8 +55,6 @@ unsigned int __cdecl ___lc_codepage_func(void);
 int __cdecl ___lc_collate_cp_func(void);
 const unsigned short* __cdecl __pctype_func(void);
 const locale_facet* __thiscall locale__Getfacet(const locale*, MSVCP_size_t);
-MSVCP_size_t __cdecl _Strftime(char*, MSVCP_size_t, const char*,
-        const struct tm*, struct __lc_time_data*);
 const locale* __cdecl locale_classic(void);
 
 #if _MSVCP_VER >= 110
diff --git a/include/msvcrt/locale.h b/include/msvcrt/locale.h
index c6262c2c315..120f39c2fcd 100644
--- a/include/msvcrt/locale.h
+++ b/include/msvcrt/locale.h
@@ -56,6 +56,7 @@ struct lconv
 };
 #endif /* _LCONV_DEFINED */
 
+struct tm;
 
 #ifdef __cplusplus
 extern "C" {
@@ -63,6 +64,7 @@ extern "C" {
 
 char*         __cdecl setlocale(int,const char*);
 struct lconv* __cdecl localeconv(void);
+size_t        __cdecl _Strftime(char*,size_t,const char*,const struct tm*,void*);
 int           __cdecl _configthreadlocale(int);
 _locale_t     __cdecl _get_current_locale(void);
 _locale_t     __cdecl _create_locale(int, const char*);