diff --git a/src/samples/net/simple_prx/main.c b/src/samples/net/simple_prx/main.c
index f37ccd81..e042d4cb 100644
--- a/src/samples/net/simple_prx/main.c
+++ b/src/samples/net/simple_prx/main.c
@@ -65,7 +65,7 @@ void start_server(const char *szIpAddr)
 	int sock;
 	int new = -1;
 	struct sockaddr_in client;
-	size_t size;
+	long unsigned int size;
 	int readbytes;
 	char data[1024];
 	fd_set set;