diff --git a/src/common/protocol.c b/src/common/protocol.c
--- a/src/common/protocol.c
+++ b/src/common/protocol.c
@@ -20,6 +20,7 @@
 #include "protocol.h"
 
 #include <malloc.h>
+#include <stdio.h>
 #include <string.h>
 
 #define DISTREN_REQUEST_MAGIC (0x32423434)