diff --git a/mingw-w64-crt/stdio/snprintf.c b/mingw-w64-crt/stdio/snprintf.c
index 30206e4..f548b3d 100644
--- a/mingw-w64-crt/stdio/snprintf.c
+++ b/mingw-w64-crt/stdio/snprintf.c
@@ -6,13 +6,13 @@
 #include <stdarg.h>
 #include <stdio.h>
 
-int snprintf(char* buffer, size_t n, const char* format, ...)
+int __cdecl snprintf(char* buffer, size_t n, const char *format, ...)
 {
   int retval;
   va_list argptr;
          
-  va_start( argptr, format );
-  retval = _vsnprintf( buffer, n, format, argptr );
-  va_end( argptr );
+  va_start(argptr, format);
+  retval = _vsnprintf (buffer, n, format, argptr);
+  va_end(argptr);
   return retval;
 }
diff --git a/mingw-w64-crt/stdio/snwprintf.c b/mingw-w64-crt/stdio/snwprintf.c
index a535eb7..67e37b7 100644
--- a/mingw-w64-crt/stdio/snwprintf.c
+++ b/mingw-w64-crt/stdio/snwprintf.c
@@ -6,13 +6,13 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int  snwprintf(wchar_t* buffer, size_t n, const wchar_t* format, ...)
+int __cdecl snwprintf(wchar_t *buffer, size_t n, const wchar_t *format, ...)
 {
     int retval;
     va_list argptr;
           
-    va_start( argptr, format );
-    retval = _vsnwprintf( buffer, n, format, argptr );
-    va_end( argptr );
+    va_start(argptr, format);
+    retval = _vsnwprintf(buffer, n, format, argptr);
+    va_end(argptr);
     return retval;
 }
diff --git a/mingw-w64-crt/stdio/vsnprintf.c b/mingw-w64-crt/stdio/vsnprintf.c
index 3f73d1b..fadda80 100644
--- a/mingw-w64-crt/stdio/vsnprintf.c
+++ b/mingw-w64-crt/stdio/vsnprintf.c
@@ -6,7 +6,7 @@
 #include <stdarg.h>
 #include <stdio.h>
 
-int vsnprintf (char* s, size_t n, const char* format, va_list arg)
+int __cdecl vsnprintf (char *s,size_t n,const char *format,va_list arg)
 {
     return _vsnprintf(s, n, format, arg);
 }
diff --git a/mingw-w64-crt/stdio/vsnwprintf.c b/mingw-w64-crt/stdio/vsnwprintf.c
index 2cdfc08..33a7e2b 100644
--- a/mingw-w64-crt/stdio/vsnwprintf.c
+++ b/mingw-w64-crt/stdio/vsnwprintf.c
@@ -7,7 +7,7 @@
 #include <stdarg.h>
 #include <wchar.h>
 
-int  vsnwprintf(wchar_t *buffer,  size_t n, const wchar_t * format, va_list argptr)
+int  __cdecl vsnwprintf(wchar_t *buffer,  size_t n, const wchar_t * format, va_list argptr)
 {
     return _vsnwprintf(buffer, n, format, argptr);
 }