diff --git a/Audio/Visualization/VisualizationController.h b/Audio/Visualization/VisualizationController.h
index 335bceb05..5b391e22d 100644
--- a/Audio/Visualization/VisualizationController.h
+++ b/Audio/Visualization/VisualizationController.h
@@ -21,7 +21,7 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)postSampleRate:(double)sampleRate;
 - (void)postVisPCM:(const float *)inPCM amount:(int)amount;
 - (double)readSampleRate;
-- (void)copyVisPCM:(float *)outPCM visFFT:(float *)outFFT latencyOffset:(double)latency;
+- (void)copyVisPCM:(float *_Nullable)outPCM visFFT:(float *_Nullable)outFFT latencyOffset:(double)latency;
 
 - (void)reset;
 
diff --git a/Audio/Visualization/VisualizationController.m b/Audio/Visualization/VisualizationController.m
index d95e69f53..6c02cd4f5 100644
--- a/Audio/Visualization/VisualizationController.m
+++ b/Audio/Visualization/VisualizationController.m
@@ -112,7 +112,7 @@ static VisualizationController *_sharedController = nil;
 	return visSamplesPosted;
 }
 
-- (void)copyVisPCM:(float *)outPCM visFFT:(float *)outFFT latencyOffset:(double)latency {
+- (void)copyVisPCM:(float *_Nullable)outPCM visFFT:(float *_Nullable)outFFT latencyOffset:(double)latency {
 	if(!outPCM && !outFFT) return;
 
 	if(!visAudio || !visAudioSize) {