diff --git a/mxml-string.c b/mxml-string.c
index 2495753..9bdb4c3 100644
--- a/mxml-string.c
+++ b/mxml-string.c
@@ -17,7 +17,8 @@
  */
 
 #include "config.h"
-
+#include <stdlib.h>
+#include <stdarg.h>
 
 /*
  * The va_copy macro is part of C99, but many compilers don't implement it.