diff --git a/src/xpdev/xpprintf.c b/src/xpdev/xpprintf.c
index 128ff3ed41d7956c122489cd70863a345e9a1213..370b642dfa4a32bd27c4196fd1b0dbf03f898569 100644
--- a/src/xpdev/xpprintf.c
+++ b/src/xpdev/xpprintf.c
@@ -1,6 +1,7 @@
 #include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include "xpprintf.h"