diff --git a/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DHCP.c b/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DHCP.c
index 04b0487..d6e74a9 100644
--- a/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DHCP.c
+++ b/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DHCP.c
@@ -156,7 +156,11 @@ struct xDHCPMessage_IPv4
 typedef struct xDHCPMessage_IPv4 DHCPMessage_IPv4_t;
 
 /* The UDP socket used for all incoming and outgoing DHCP traffic. */
+#ifdef CBMC
+Socket_t xDHCPSocket;
+#else
 static Socket_t xDHCPSocket;
+#endif
 
 #if( ipconfigDHCP_FALL_BACK_AUTO_IP != 0 )
 	/* Define the Link Layer IP address: 169.254.x.x */
@@ -179,7 +183,11 @@ static void prvSendDHCPDiscover( void );
 /*
  * Interpret message received on the DHCP socket.
  */
+#ifdef CBMC
+BaseType_t prvProcessDHCPReplies( BaseType_t xExpectedMessageType );
+#else
 static BaseType_t prvProcessDHCPReplies( BaseType_t xExpectedMessageType );
+#endif
 
 /*
  * Generate a DHCP request packet, and send it on the DHCP socket.
@@ -204,7 +212,11 @@ static uint8_t *prvCreatePartDHCPMessage( struct freertos_sockaddr *pxAddress,
 /*
  * Create the DHCP socket, if it has not been created already.
  */
+#ifdef CBMC
+void prvCreateDHCPSocket( void );
+#else
 static void prvCreateDHCPSocket( void );
+#endif
 
 /*
  * Close the DHCP socket.
@@ -223,7 +235,11 @@ static void prvCloseDHCPSocket( void );
 /*-----------------------------------------------------------*/
 
 /* Hold information in between steps in the DHCP state machine. */
+#ifdef CBMC
+DHCPData_t xDHCPData;
+#else
 static DHCPData_t xDHCPData;
+#endif
 
 /*-----------------------------------------------------------*/
 
@@ -623,7 +639,11 @@ static void prvInitialiseDHCP( void )
 }
 /*-----------------------------------------------------------*/
 
+#ifdef CBMC
+BaseType_t prvProcessDHCPReplies( BaseType_t xExpectedMessageType )
+#else
 static BaseType_t prvProcessDHCPReplies( BaseType_t xExpectedMessageType )
+#endif
 {
 uint8_t *pucUDPPayload;
 int32_t lBytes;