diff --git a/src/coreimage.cs b/src/coreimage.cs
index 04f9618149..070ffb068b 100644
--- a/src/coreimage.cs
+++ b/src/coreimage.cs
@@ -419,7 +419,7 @@ namespace XamCore.CoreImage {
 		NSData GetJpegRepresentation (CIImage image, CGColorSpace colorSpace, CIImageRepresentationOptions options);
 #endif
 
-		[iOS (11,0)][TV (11,0)][Mac (10,13)]
+		[iOS (11,0)][TV (11,0)][Mac (10,13,4)]
 		[Export ("HEIFRepresentationOfImage:format:colorSpace:options:")]
 		[return: NullAllowed]
 		NSData GetHeifRepresentation (CIImage image, CIFormat format, CGColorSpace colorSpace, NSDictionary options);
@@ -463,7 +463,7 @@ namespace XamCore.CoreImage {
 		bool WriteJpegRepresentation (CIImage image, NSUrl url, CGColorSpace colorSpace, CIImageRepresentationOptions options, [NullAllowed] out NSError error);
 #endif
 
-		[iOS (11,0)][TV (11,0)][Mac (10,13)]
+		[iOS (11,0)][TV (11,0)][Mac (10,13,4)]
 		[Export ("writeHEIFRepresentationOfImage:toURL:format:colorSpace:options:error:")]
 		bool WriteHeifRepresentation (CIImage image, NSUrl url, CIFormat format, CGColorSpace colorSpace, NSDictionary options, [NullAllowed] out NSError error);
 
diff --git a/src/foundation.cs b/src/foundation.cs
index 0503a1afcb..fad284d2fd 100644
--- a/src/foundation.cs
+++ b/src/foundation.cs
@@ -68,6 +68,12 @@ using OSType = System.UInt32;
 using NSTimeInterval = System.Double;
 #endif
 
+#if WATCH
+using CIBarcodeDescriptor = XamCore.Foundation.NSObject;
+#else
+using XamCore.CoreImage;
+#endif
+
 // This little gem comes from a btouch bug that wrote the NSFilePresenterReacquirer delegate to the wrong
 // namespace for a while (it should go into Foundation, but due to the bug it went into UIKit). In order
 // to not break backwards compatibility (once the btouch bug was fixed), we need to make sure the delegate
@@ -5086,6 +5092,12 @@ namespace XamCore.Foundation
 		[Watch (4, 0), TV (11, 0), Mac (10, 13), iOS (11, 0)]
 		[NullAllowed, Export ("referrerURL", ArgumentSemantic.Copy)]
 		NSUrl ReferrerUrl { get; set; }
+
+		// From NSUserActivity (CIBarcodeDescriptor)
+
+		[TV (11,3), Mac (10,13,4, onlyOn64: true), iOS (11,3), NoWatch]
+		[NullAllowed, Export ("detectedBarcodeDescriptor", ArgumentSemantic.Copy)]
+		CIBarcodeDescriptor DetectedBarcodeDescriptor { get; }
 	}
 
 	[iOS (8,0)][Mac (10,10, onlyOn64 : true)] // same as NSUserActivity
diff --git a/tests/xtro-sharpie/iOS-CoreImage.todo b/tests/xtro-sharpie/iOS-CoreImage.todo
index e6825f5ba6..e69de29bb2 100644
--- a/tests/xtro-sharpie/iOS-CoreImage.todo
+++ b/tests/xtro-sharpie/iOS-CoreImage.todo
@@ -1 +0,0 @@
-!missing-selector! NSUserActivity::detectedBarcodeDescriptor not bound
diff --git a/tests/xtro-sharpie/macOS-CoreImage.todo b/tests/xtro-sharpie/macOS-CoreImage.todo
index e6825f5ba6..e69de29bb2 100644
--- a/tests/xtro-sharpie/macOS-CoreImage.todo
+++ b/tests/xtro-sharpie/macOS-CoreImage.todo
@@ -1 +0,0 @@
-!missing-selector! NSUserActivity::detectedBarcodeDescriptor not bound
diff --git a/tests/xtro-sharpie/tvOS-CoreImage.todo b/tests/xtro-sharpie/tvOS-CoreImage.todo
index e6825f5ba6..e69de29bb2 100644
--- a/tests/xtro-sharpie/tvOS-CoreImage.todo
+++ b/tests/xtro-sharpie/tvOS-CoreImage.todo
@@ -1 +0,0 @@
-!missing-selector! NSUserActivity::detectedBarcodeDescriptor not bound