diff --git a/librfc822/test.c b/librfc822/test.c
index 6a752c3..c504877 100644
--- a/librfc822/test.c
+++ b/librfc822/test.c
@@ -18,6 +18,7 @@
 */
 
 #include <stdio.h>
+#include <stdlib.h>
 #ifdef DEBUG_DMALLOC
 #  include <dmalloc.h>
 #endif