diff --git a/tsf.h b/tsf.h
index a81f25d..94d7812 100644
--- a/tsf.h
+++ b/tsf.h
@@ -1604,7 +1604,7 @@ TSFDEF int tsf_note_on(tsf* f, int preset_index, int key, float vel)
 				struct tsf_voice* newVoices;
 				f->voiceNum += 4;
 				newVoices = (struct tsf_voice*)TSF_REALLOC(f->voices, f->voiceNum * sizeof(struct tsf_voice));
-				if (!newVoices) return 0;
+				if (!newVoices) { f->voiceNum -= 4; return 0; }
 				f->voices = newVoices;
 				voice = &f->voices[f->voiceNum - 4];
 				voice[1].playingPreset = voice[2].playingPreset = voice[3].playingPreset = -1;
@@ -2077,3 +2077,4 @@ TSFDEF float tsf_channel_get_tuning(tsf* f, int channel)
 #endif
 
 #endif //TSF_IMPLEMENTATION
+