diff --git a/src/include/lwip/memp.h b/src/include/lwip/memp.h
index 68fcd991..562cd05b 100644
--- a/src/include/lwip/memp.h
+++ b/src/include/lwip/memp.h
@@ -38,6 +38,8 @@
 #ifndef LWIP_HDR_MEMP_H
 #define LWIP_HDR_MEMP_H
 
+#include "lwip/opt.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif