diff --git a/audio/audio.c b/audio/audio.c
index 08aec51e70..29da359b41 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -1139,7 +1139,8 @@ static void audio_run_out (AudioState *s)
             }
 
             if (sw->active) {
-                sw->callback.fn(sw->callback.opaque, INT_MAX);
+                sw->callback.fn(sw->callback.opaque,
+                                hw_free * sw->info.bytes_per_frame);
             }
 
             continue;