diff --git a/stream_buffer.c b/stream_buffer.c
index cbc0939b3..2306b5d9b 100644
--- a/stream_buffer.c
+++ b/stream_buffer.c
@@ -436,11 +436,13 @@ static void prvInitialiseNewStreamBuffer( StreamBuffer_t * const pxStreamBuffer,
         configASSERT( xBufferSizeBytes > sbBYTES_TO_STORE_MESSAGE_LENGTH );
 
         #if ( configASSERT_DEFINED == 1 )
-
+        {
             /* Sanity check that the size of the structure used to declare a
              * variable of type StaticStreamBuffer_t equals the size of the real
              * message buffer structure. */
-            configASSERT( sizeof( StaticStreamBuffer_t ) == sizeof( StreamBuffer_t ) );
+            volatile size_t xSize = sizeof( StaticStreamBuffer_t );
+            configASSERT( xSize == sizeof( StreamBuffer_t ) );
+        } /*lint !e529 xSize is referenced is configASSERT() is defined. */
         #endif /* configASSERT_DEFINED */
 
         if( ( pucStreamBufferStorageArea != NULL ) && ( pxStaticStreamBuffer != NULL ) )