diff --git a/cws2fws.c b/cws2fws.c
index 61f12940d5..5d8f524b7a 100644
--- a/cws2fws.c
+++ b/cws2fws.c
@@ -8,6 +8,8 @@
 
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <zlib.h>