diff --git a/xpp/mpptalk.c b/xpp/mpptalk.c
index 14de689..e49c3cd 100644
--- a/xpp/mpptalk.c
+++ b/xpp/mpptalk.c
@@ -20,6 +20,7 @@
  *
  */
 
+#include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <assert.h>