diff --git a/src/module/audio/sink_api.c b/src/module/audio/sink_api.c
index c0a94031f105..fb576adc40e7 100644
--- a/src/module/audio/sink_api.c
+++ b/src/module/audio/sink_api.c
@@ -109,7 +109,15 @@ EXPORT_SYMBOL(sink_get_frame_bytes);
 
 size_t sink_get_free_frames(struct sof_sink *sink)
 {
-	return sink_get_free_size(sink) / sink_get_frame_bytes(sink);
+	size_t frame_bytes = sink_get_frame_bytes(sink);
+
+	/* frame_bytes is channels * sample_size and both are host-influenced;
+	 * guard against a zero divisor (e.g. channels == 0)
+	 */
+	if (!frame_bytes)
+		return 0;
+
+	return sink_get_free_size(sink) / frame_bytes;
 }
 EXPORT_SYMBOL(sink_get_free_frames);