diff --git a/tools/testing/selftests/alsa/test-pcmtest-driver.c b/tools/testing/selftests/alsa/test-pcmtest-driver.c
index e025a7bac26b..18ee72d5d4c9 100644
--- a/tools/testing/selftests/alsa/test-pcmtest-driver.c
+++ b/tools/testing/selftests/alsa/test-pcmtest-driver.c
@@ -265,7 +265,7 @@ TEST_F(pcmtest, ni_capture) {
 	snd_pcm_close(handle);
 
 	for (i = 0; i < CH_NUM; i++) {
-		for (j = 0; j < params.rate * params.time; j++)
+		for (j = 0; j < params.rate * params.time * params.sample_size; j++)
 			ASSERT_EQ(chan_samples[i][j], patterns[i].buf[j % patterns[i].len]);
 		free(chan_samples[i]);
 	}