diff --git a/lib/des/rpw.c b/lib/des/rpw.c
index 3ca4cec85..7d29ec9ab 100644
--- a/lib/des/rpw.c
+++ b/lib/des/rpw.c
@@ -60,6 +60,7 @@
 #include <config.h>
 #endif
 #include <stdio.h>
+#include <stdlib.h>
 #include "des.h"
 
 int main(argc,argv)
diff --git a/lib/des/speed.c b/lib/des/speed.c
index 61179941e..3d588ecd4 100644
--- a/lib/des/speed.c
+++ b/lib/des/speed.c
@@ -68,6 +68,7 @@
 #endif
 
 #include <stdio.h>
+#include <stdlib.h>
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif