diff --git a/docs/website/mmp-errors.md b/docs/website/mmp-errors.md
index 9441add90717..87080c325b2a 100644
--- a/docs/website/mmp-errors.md
+++ b/docs/website/mmp-errors.md
@@ -221,8 +221,6 @@ Consider updating your application and any dependencies to 64-bit.
 
 ### <a name="MM202x"/>MM202x: Binding Optimizer failed processing `...`.
 
-### <a name="MM2100"/>MM2100: Xamarin.Mac Classic API does not support Platform Linking.
-
 ### <a name="MM2103"/>MM2103: Error processing assembly '\*': *
 
 An unexpected error occured when processing an assembly.
@@ -268,6 +266,8 @@ This is in general safe, and will reduce application bundle size as an added ben
 
 Consider using `lipo` to remove the unnecessary archtectures permanently from the source library. If the application is not being published to the App Store, this removal can be disabled by passing --optimize=-trim-architectures as Additional MMP Arguments.
 
+### <a name="MM2109"/>MM2109: Xamarin.Mac Classic API does not support Platform Linking.
+
 
 # MM3xxx: AOT
 
diff --git a/tools/mmp/driver.cs b/tools/mmp/driver.cs
index 0251194d9502..6d5e6d5750ec 100644
--- a/tools/mmp/driver.cs
+++ b/tools/mmp/driver.cs
@@ -462,7 +462,7 @@ static void Main2 (string [] args)
 				throw new MonoMacException (1404, true, "Target framework '{0}' is invalid.", userTargetFramework);
 
 			if (IsClassic && App.LinkMode == LinkMode.Platform)
-				throw new MonoMacException (2100, true, "Xamarin.Mac Classic API does not support Platform Linking.");
+				throw new MonoMacException (2109, true, "Xamarin.Mac Classic API does not support Platform Linking.");
 
 			// sanity check as this should never happen: we start out by not setting any
 			// Unified/Classic properties, and only IsUnifiedMobile if we are are on the