diff --git a/polyp/module-protocol-stub.c b/polyp/module-protocol-stub.c
index 37a17c86d..7cd5ed3f8 100644
--- a/polyp/module-protocol-stub.c
+++ b/polyp/module-protocol-stub.c
@@ -28,6 +28,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <limits.h>
 
 #ifdef HAVE_SYS_SOCKET_H
 #include <sys/socket.h>