diff --git a/features/lwipstack/lwip-sys/arch/cc.h b/features/lwipstack/lwip-sys/arch/cc.h
index 619e144efd9..2510a11cfc9 100644
--- a/features/lwipstack/lwip-sys/arch/cc.h
+++ b/features/lwipstack/lwip-sys/arch/cc.h
@@ -34,6 +34,7 @@
 
 #include <stdint.h>
 #include <stddef.h> /* for size_t */
+#include "mbed_toolchain.h"
 
 #if LWIP_USE_EXTERNAL_MBEDTLS
 #include "mbedtls/md5.h"