diff --git a/libaegisub/audio/provider.cpp b/libaegisub/audio/provider.cpp
index df2af5b6d..ad0f2e679 100644
--- a/libaegisub/audio/provider.cpp
+++ b/libaegisub/audio/provider.cpp
@@ -116,6 +116,7 @@ void AudioProvider::FillBufferInt16Mono(int16_t* buf, int64_t start, int64_t cou
 					buf[i] = DownmixToMono<ConvertIntToInt16>(ConvertIntToInt16(buff, bytes_per_sample), channels)[i];
 		}
 	}
+	free(buff);
 }
 
 void AudioProvider::GetInt16MonoAudioWithVolume(int16_t *buf, int64_t start, int64_t count, double volume) const {
diff --git a/src/audio_renderer_waveform.cpp b/src/audio_renderer_waveform.cpp
index 789dca024..94da035f5 100644
--- a/src/audio_renderer_waveform.cpp
+++ b/src/audio_renderer_waveform.cpp
@@ -80,9 +80,6 @@ void AudioWaveformRenderer::Render(wxBitmap &bmp, int start, AudioRenderingStyle
 
 	double cur_sample = start * pixel_samples;
 
-	assert(provider->GetBytesPerSample() == 2);
-	assert(provider->GetChannels() == 1);
-
 	wxPen pen_peaks(wxPen(pal->get(0.4f)));
 	wxPen pen_avgs(wxPen(pal->get(0.7f)));