diff --git a/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_TCP_WIN.c b/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_TCP_WIN.c
index 0078ab313..b0cccbad8 100644
--- a/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_TCP_WIN.c
+++ b/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_TCP_WIN.c
@@ -192,8 +192,12 @@ extern void vListInsertGeneric( List_t * const pxList, ListItem_t * const pxNewL
 
 /* List of free TCP segments. */
 #if( ipconfigUSE_TCP_WIN == 1 )
+#ifdef CBMC
+	List_t xSegmentList;
+#else
 	static List_t xSegmentList;
 #endif
+#endif
 
 /* Logging verbosity level. */
 BaseType_t xTCPWindowLoggingLevel = 0;