diff --git a/src/audio/detect_test.c b/src/audio/detect_test.c
index 249b9d7a94ca..db4496daf3c3 100644
--- a/src/audio/detect_test.c
+++ b/src/audio/detect_test.c
@@ -613,7 +613,7 @@ static int test_keyword_copy(struct comp_dev *dev)
 
 	/* copy and perform detection */
 	cd->detect_func(dev, source,
-			source->avail / comp_frame_bytes(source->source));
+			source->avail / comp_frame_bytes(dev));
 
 	/* calc new available */
 	comp_update_buffer_consume(source, source->avail);