diff --git a/src/trace/dma-trace.c b/src/trace/dma-trace.c
index 61c5acff0147..6fa9d2d02529 100644
--- a/src/trace/dma-trace.c
+++ b/src/trace/dma-trace.c
@@ -385,6 +385,8 @@ void dma_trace_flush(void *t)
 				(char *)buffer->addr;
 	}
 
+	size = MIN(size, MAILBOX_TRACE_SIZE);
+
 	/* invalidate trace data */
 	dcache_invalidate_region((void *)t, size);