Index: src/asprintf.m
==================================================================
--- src/asprintf.m
+++ src/asprintf.m
@@ -17,10 +17,14 @@
 #include "config.h"
 
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+
+#ifdef __MINGW32__
+# define vsnprintf _vsnprintf
+#endif
 
 int
 vasprintf(char **cString, const char *format, va_list arguments)
 {
 	int length;