diff --git a/source/include/FreeRTOS_Routing.h b/source/include/FreeRTOS_Routing.h
index 4373db800..eb5fcb52b 100644
--- a/source/include/FreeRTOS_Routing.h
+++ b/source/include/FreeRTOS_Routing.h
@@ -31,6 +31,7 @@
 
 /* Core FreeRTOS+TCP Includes. */
     #include "FreeRTOS_IP.h"
+    #include "FreeRTOS_Sockets.h"
 
 /* Optional FreeRTOS+TCP Includes. */
     #if ( ipconfigUSE_DHCP != 0 )