diff --git a/tools/pak/pak.c b/tools/pak/pak.c
index 3dd2dc94e..c066e6119 100644
--- a/tools/pak/pak.c
+++ b/tools/pak/pak.c
@@ -35,6 +35,7 @@ static const char rcsid[] =
 #include <getopt.h>
 #include <errno.h>
 #include <string.h>
+#include <stdlib.h>
 
 #include <QF/qtypes.h>