diff --git a/sound/pci/ctxfi/ctpcm.c b/sound/pci/ctxfi/ctpcm.c
index a0bd31c..870fa17 100644
--- a/sound/pci/ctxfi/ctpcm.c
+++ b/sound/pci/ctxfi/ctpcm.c
@@ -243,6 +243,8 @@
 	/* Read out playback position */
 	position = atc->pcm_playback_position(atc, apcm);
 	position = bytes_to_frames(runtime, position);
+	if (position >= runtime->buffer_size)
+		position = 0;
 	return position;
 }
 
@@ -343,6 +345,8 @@
 	/* Read out playback position */
 	position = atc->pcm_capture_position(atc, apcm);
 	position = bytes_to_frames(runtime, position);
+	if (position >= runtime->buffer_size)
+		position = 0;
 	return position;
 }