diff --git a/src/common/protocol.c b/src/common/protocol.c
--- a/src/common/protocol.c
+++ b/src/common/protocol.c
@@ -24,7 +24,7 @@
 #include <stdio.h>
 #include <string.h>
 
-#define DISTREN_REQUEST_MAGIC (0x32423434)
+#define DISTREN_REQUEST_MAGIC ((uint32_t)0x32423434)
 
 int distren_request_new(struct distren_request **req, uint32_t len, enum distren_request_type type)
 {