diff --git a/include/msvcrt/corecrt_wstdio.h b/include/msvcrt/corecrt_wstdio.h
index 3951a1c8297..c1779fb81ad 100644
--- a/include/msvcrt/corecrt_wstdio.h
+++ b/include/msvcrt/corecrt_wstdio.h
@@ -115,7 +115,7 @@ static inline int __cdecl _vsnwprintf_s(wchar_t *buffer, size_t size, size_t cou
     return ret < 0 ? -1 : ret;
 }
 
-static inline int __cdecl _snwprintf_s(wchar_t *buffer, size_t size, size_t count, const wchar_t *format, ...)
+static inline int WINAPIV _snwprintf_s(wchar_t *buffer, size_t size, size_t count, const wchar_t *format, ...)
 {
     int ret;
     __ms_va_list args;
diff --git a/include/msvcrt/stdio.h b/include/msvcrt/stdio.h
index e184704eb93..f2aef46e6ff 100644
--- a/include/msvcrt/stdio.h
+++ b/include/msvcrt/stdio.h
@@ -174,7 +174,7 @@ static inline int __cdecl _vsnprintf_s(char *buffer, size_t size, size_t count,
     return ret < 0 ? -1 : ret;
 }
 
-static inline int __cdecl _snprintf_s(char *buffer, size_t size, size_t count, const char *format, ...)
+static inline int WINAPIV _snprintf_s(char *buffer, size_t size, size_t count, const char *format, ...)
 {
     int ret;
     __ms_va_list args;