diff --git a/include/my_global.h b/include/my_global.h
index 816c9dd87c6..fd31de115c8 100644
--- a/include/my_global.h
+++ b/include/my_global.h
@@ -1077,7 +1077,7 @@ typedef ulong		myf;	/* Type of MyFlags in my_funcs */
 static inline char *dlerror(void)
 {
   static char win_errormsg[2048];
-  FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM,
+  FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM,
     0, GetLastError(), 0, win_errormsg, 2048, NULL);
   return win_errormsg;
 }