diff --git a/cyassl/ctaocrypt/settings.h b/cyassl/ctaocrypt/settings.h
index ad93345a8..e37eec6f8 100644
--- a/cyassl/ctaocrypt/settings.h
+++ b/cyassl/ctaocrypt/settings.h
@@ -166,6 +166,7 @@
         #include "fs.h"
     #endif
     #define CYASSL_LWIP
+    #include <errno.h>  /* for tcp errno */
     #define CYASSL_SAFERTOS
     #if defined(__IAR_SYSTEMS_ICC__)
         /* enum uses enum */