diff --git a/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DNS.c b/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DNS.c
index 480d50b..5557253 100644
--- a/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DNS.c
+++ b/FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_DNS.c
@@ -114,7 +114,11 @@ static Socket_t prvCreateDNSSocket( void );
 /*
  * Create the DNS message in the zero copy buffer passed in the first parameter.
  */
+#ifdef CBMC
+size_t prvCreateDNSMessage( uint8_t *pucUDPPayloadBuffer,
+#else
 static size_t prvCreateDNSMessage( uint8_t *pucUDPPayloadBuffer,
+#endif
 								   const char *pcHostName,
 								   TickType_t uxIdentifier );
 
@@ -122,7 +126,11 @@ static size_t prvCreateDNSMessage( uint8_t *pucUDPPayloadBuffer,
  * Simple routine that jumps over the NAME field of a resource record.
  * It returns the number of bytes read.
  */
+#ifdef CBMC
+size_t prvSkipNameField( const uint8_t *pucByte,
+#else
 static size_t prvSkipNameField( const uint8_t *pucByte,
+#endif
 								size_t uxLength );
 
 /*
@@ -130,7 +138,11 @@ static size_t prvSkipNameField( const uint8_t *pucByte,
  * The parameter 'xExpected' indicates whether the identifier in the reply
  * was expected, and thus if the DNS cache may be updated with the reply.
  */
+#ifdef CBMC
+uint32_t prvParseDNSReply( uint8_t *pucUDPPayloadBuffer,
+#else
 static uint32_t prvParseDNSReply( uint8_t *pucUDPPayloadBuffer,
+#endif
 								  size_t uxBufferLength,
 								  BaseType_t xExpected );
 
@@ -184,7 +196,11 @@ static uint32_t prvGetHostByName( const char *pcHostName,
 
 
 #if( ipconfigUSE_DNS_CACHE == 1 ) || ( ipconfigDNS_USE_CALLBACKS == 1 )
+#ifdef CBMC
+	size_t prvReadNameField( const uint8_t *pucByte,
+#else
 	static size_t prvReadNameField( const uint8_t *pucByte,
+#endif
 									size_t uxRemainingBytes,
 									char *pcName,
 									size_t uxDestLen );
@@ -758,7 +774,11 @@ TickType_t uxWriteTimeOut_ticks = ipconfigDNS_SEND_BLOCK_TIME_TICKS;
 }
 /*-----------------------------------------------------------*/
 
+#ifdef CBMC
+size_t prvCreateDNSMessage( uint8_t *pucUDPPayloadBuffer,
+#else
 static size_t prvCreateDNSMessage( uint8_t *pucUDPPayloadBuffer,
+#endif
 								   const char *pcHostName,
 								   TickType_t uxIdentifier )
 {
@@ -838,7 +858,11 @@ static const DNSMessage_t xDefaultPartDNSHeader =
 
 #if( ipconfigUSE_DNS_CACHE == 1 ) || ( ipconfigDNS_USE_CALLBACKS == 1 )
 
+#ifdef CBMC
+	size_t prvReadNameField( const uint8_t *pucByte,
+#else
 	static size_t prvReadNameField( const uint8_t *pucByte,
+#endif
 									size_t uxRemainingBytes,
 									char *pcName,
 									size_t uxDestLen )
@@ -932,7 +956,11 @@ static const DNSMessage_t xDefaultPartDNSHeader =
 #endif	/* ipconfigUSE_DNS_CACHE || ipconfigDNS_USE_CALLBACKS */
 /*-----------------------------------------------------------*/
 
+#ifdef CBMC
+size_t prvSkipNameField( const uint8_t *pucByte,
+#else
 static size_t prvSkipNameField( const uint8_t *pucByte,
+#endif
 								size_t uxLength )
 {
 size_t uxChunkLength;
@@ -1050,7 +1078,11 @@ size_t uxPayloadSize;
 #endif /* ipconfigUSE_NBNS */
 /*-----------------------------------------------------------*/
 
+#ifdef CBMC
+uint32_t prvParseDNSReply( uint8_t *pucUDPPayloadBuffer,
+#else
 static uint32_t prvParseDNSReply( uint8_t *pucUDPPayloadBuffer,
+#endif
 								  size_t uxBufferLength,
 								  BaseType_t xExpected )
 {