diff --git a/Cocoa/Document.m b/Cocoa/Document.m
index 25fa66d..7f5a887 100644
--- a/Cocoa/Document.m
+++ b/Cocoa/Document.m
@@ -128,7 +128,9 @@ static uint32_t rgbEncode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
         GB_apu_copy_buffer(&gb, buffer, nFrames);
     } andSampleRate:96000];
     self.view.mouseHidingEnabled = (self.mainWindow.styleMask & NSFullScreenWindowMask) != 0;
-    [self.audioClient start];
+    if (![[NSUserDefaults standardUserDefaults] boolForKey:@"Mute"]) {
+        [self.audioClient start];
+    }
     NSTimer *hex_timer = [NSTimer timerWithTimeInterval:0.25 target:self selector:@selector(reloadMemoryView) userInfo:nil repeats:YES];
     [[NSRunLoop mainRunLoop] addTimer:hex_timer forMode:NSDefaultRunLoopMode];
     while (running) {
@@ -312,6 +314,7 @@ static uint32_t rgbEncode(GB_gameboy_t *gb, uint8_t r, uint8_t g, uint8_t b)
     else {
         [self.audioClient start];
     }
+    [[NSUserDefaults standardUserDefaults] setBool:!self.audioClient.isPlaying forKey:@"Mute"];
 }
 
 - (IBAction)toggleBlend:(id)sender