diff --git a/src/api/if.c b/src/api/if.c
index 4ed939d3..62ec8a9c 100644
--- a/src/api/if.c
+++ b/src/api/if.c
@@ -40,6 +40,7 @@
 
 #if LWIP_SOCKET
 
+#include "lwip/if.h"
 #include "lwip/netifapi.h"
 
 char *