diff --git a/backends/playback/zsm/zsm_backend.hpp b/backends/playback/zsm/zsm_backend.hpp
index d8f0286..c5e6037 100644
--- a/backends/playback/zsm/zsm_backend.hpp
+++ b/backends/playback/zsm/zsm_backend.hpp
@@ -85,7 +85,7 @@ class ZsmBackend : public PlaybackBackend {
     }
     void audio_step(size_t samples) {
     	if (samples == 0) return;
-     	while (pcm_fifo_avail() < samples) {
+     	while (remain != 0 && pcm_fifo_avail() < samples) {
      		if (pcm_read_rate() == 0) break;
             if ((--remain) == 0) {
                 if (islooped) {