diff --git a/src/AudioToolbox/SystemSound.cs b/src/AudioToolbox/SystemSound.cs
index 05a723705d26..23fbca9a364d 100644
--- a/src/AudioToolbox/SystemSound.cs
+++ b/src/AudioToolbox/SystemSound.cs
@@ -291,14 +291,20 @@ public Task PlaySystemSoundAsync ()
 		unsafe static extern void AudioServicesPlaySystemSoundWithCompletion (uint inSystemSoundID, BlockLiteral* inCompletionBlock);
 
 		[DllImport (Constants.AudioToolboxLibrary)]
-		static extern AudioServicesError AudioServicesCreateSystemSoundID (IntPtr fileUrl, out uint soundId);
+		unsafe static extern AudioServicesError AudioServicesCreateSystemSoundID (IntPtr fileUrl, uint* soundId);
 
 		static uint Create (NSUrl fileUrl)
 		{
+			AudioServicesError error;
+			uint soundId;
+
 			if (fileUrl is null)
 				ObjCRuntime.ThrowHelper.ThrowArgumentNullException (nameof (fileUrl));
 
-			var error = AudioServicesCreateSystemSoundID (fileUrl.Handle, out var soundId);
+			unsafe {
+				error = AudioServicesCreateSystemSoundID (fileUrl.Handle, &soundId);
+			}
+
 			if (error != AudioServicesError.None)
 				throw new InvalidOperationException (string.Format ("Could not create system sound ID for url {0}; error={1}",
 							fileUrl, error));
@@ -312,10 +318,15 @@ public SystemSound (NSUrl fileUrl)
 
 		public static SystemSound? FromFile (NSUrl fileUrl)
 		{
+			AudioServicesError error;
+			uint soundId;
+
 			if (fileUrl is null)
 				ObjCRuntime.ThrowHelper.ThrowArgumentNullException (nameof (fileUrl));
 
-			var error = AudioServicesCreateSystemSoundID (fileUrl.Handle, out var soundId);
+			unsafe {
+				error = AudioServicesCreateSystemSoundID (fileUrl.Handle, &soundId);
+			}
 			if (error != AudioServicesError.None)
 				return null;
 			return new SystemSound (soundId, true);
@@ -323,11 +334,16 @@ public SystemSound (NSUrl fileUrl)
 
 		public static SystemSound? FromFile (string filename)
 		{
+			AudioServicesError error;
+			uint soundId;
+
 			if (filename is null)
 				ObjCRuntime.ThrowHelper.ThrowArgumentNullException (nameof (filename));
 
 			using (var url = new NSUrl (filename)) {
-				var error = AudioServicesCreateSystemSoundID (url.Handle, out var soundId);
+				unsafe {
+					error = AudioServicesCreateSystemSoundID (url.Handle, &soundId);
+				}
 				if (error != AudioServicesError.None)
 					return null;
 				return new SystemSound (soundId, true);
diff --git a/tests/cecil-tests/BlittablePInvokes.KnownFailures.cs b/tests/cecil-tests/BlittablePInvokes.KnownFailures.cs
index eb6ca058d6e4..f58d8eca3c19 100644
--- a/tests/cecil-tests/BlittablePInvokes.KnownFailures.cs
+++ b/tests/cecil-tests/BlittablePInvokes.KnownFailures.cs
@@ -78,7 +78,6 @@ public partial class BlittablePInvokes {
 			"AudioToolbox.AudioQueueStatus AudioToolbox.OutputAudioQueue::AudioQueueSetOfflineRenderFormat(System.IntPtr,AudioToolbox.AudioStreamBasicDescription&,System.IntPtr)",
 			"AudioToolbox.AudioServicesError AudioToolbox.AudioServices::AudioServicesGetProperty(AudioToolbox.AudioServicesPropertyKey,System.UInt32,System.UInt32&,System.UInt32&,System.UInt32&)",
 			"AudioToolbox.AudioServicesError AudioToolbox.AudioServices::AudioServicesSetProperty(AudioToolbox.AudioServicesPropertyKey,System.UInt32,System.UInt32&,System.UInt32,System.UInt32&)",
-			"AudioToolbox.AudioServicesError AudioToolbox.SystemSound::AudioServicesCreateSystemSoundID(System.IntPtr,System.UInt32&)",
 			"AudioToolbox.MusicPlayerStatus AudioToolbox.MusicPlayer::MusicPlayerGetBeatsForHostTime(System.IntPtr,System.Int64,System.Double&)",
 			"AudioToolbox.MusicPlayerStatus AudioToolbox.MusicPlayer::MusicPlayerGetHostTimeForBeats(System.IntPtr,System.Double,System.Int64&)",
 			"AudioToolbox.MusicPlayerStatus AudioToolbox.MusicPlayer::MusicPlayerGetPlayRateScalar(System.IntPtr,System.Double&)",