diff --git a/msbuild/Xamarin.Mac.Tasks/Xamarin.Mac.Common.targets b/msbuild/Xamarin.Mac.Tasks/Xamarin.Mac.Common.targets
index 4e2d278372f7..cbafbb1d4063 100644
--- a/msbuild/Xamarin.Mac.Tasks/Xamarin.Mac.Common.targets
+++ b/msbuild/Xamarin.Mac.Tasks/Xamarin.Mac.Common.targets
@@ -432,6 +432,7 @@ Copyright (C) 2014 Xamarin. All rights reserved.
 			Prefix="xammac"
 			NoOverwrite="@(_BundleResourceWithLogicalName)"
 			IntermediateOutputPath="$(IntermediateOutputPath)"
+			TargetFrameworkDirectory="$(TargetFrameworkDirectory)"
 			ReferencedLibraries="@(ResolvedFiles)">
 			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="_BundleResourceWithLogicalName" />
 			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="FileWrites" />
diff --git a/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/UnpackLibraryResourcesTaskBase.cs b/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/UnpackLibraryResourcesTaskBase.cs
index ab19ba3d2601..87d3772eb617 100644
--- a/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/UnpackLibraryResourcesTaskBase.cs
+++ b/msbuild/Xamarin.MacDev.Tasks.Core/Tasks/UnpackLibraryResourcesTaskBase.cs
@@ -26,6 +26,9 @@ public abstract class UnpackLibraryResourcesTaskBase : Task
 		[Required]
 		public ITaskItem[] ReferencedLibraries { get; set; }
 
+		[Required]
+		public ITaskItem[] TargetFrameworkDirectory { get; set; }
+
 		#endregion
 
 		#region Outputs
@@ -42,6 +45,7 @@ public override bool Execute ()
 			Log.LogTaskProperty ("IntermediateOutputPath", IntermediateOutputPath);
 			Log.LogTaskProperty ("NoOverwrite", NoOverwrite);
 			Log.LogTaskProperty ("ReferencedLibraries", ReferencedLibraries);
+			Log.LogTaskProperty ("TargetFrameworkDirectory", TargetFrameworkDirectory);
 
 			// TODO: give each assembly its own intermediate output directory
 			// TODO: use list file to avoid re-extracting assemblies but allow FileWrites to work
@@ -49,7 +53,9 @@ public override bool Execute ()
 			HashSet<string> ignore = null;
 
 			foreach (var asm in ReferencedLibraries) {
-				if (asm.GetMetadata ("ResolvedFrom") == "{TargetFrameworkDirectory}") {
+				// mscorlib.dll was not coming out with ResolvedFrom == {TargetFrameworkDirectory}
+				// and what we really care is where it comes from, not how it was resolved
+				if (IsFrameworkAssembly (asm)) {
 					Log.LogMessage (MessageImportance.Low, "  Skipping framework assembly: {0}", asm.ItemSpec);
 				} else {
 					var extracted = ExtractContentAssembly (asm.ItemSpec, IntermediateOutputPath);
@@ -83,6 +89,16 @@ public override bool Execute ()
 			return !Log.HasLoggedErrors;
 		}
 
+		bool IsFrameworkAssembly (ITaskItem asm)
+		{
+			var asm_path = asm.GetMetadata ("FullPath");
+			foreach (var dir in TargetFrameworkDirectory) {
+				if (asm_path.StartsWith (dir.GetMetadata ("FullPath"), StringComparison.OrdinalIgnoreCase))
+					return true;
+			}
+			return false;
+		}
+
 		IEnumerable<ITaskItem> ExtractContentAssembly (string assembly, string intermediatePath)
 		{
 			Log.LogMessage (MessageImportance.Low, "  Inspecting assembly: {0}", assembly);
diff --git a/msbuild/Xamarin.iOS.Tasks.Core/Xamarin.iOS.Common.targets b/msbuild/Xamarin.iOS.Tasks.Core/Xamarin.iOS.Common.targets
index 021308248d3b..986f4f56a1af 100644
--- a/msbuild/Xamarin.iOS.Tasks.Core/Xamarin.iOS.Common.targets
+++ b/msbuild/Xamarin.iOS.Tasks.Core/Xamarin.iOS.Common.targets
@@ -531,6 +531,7 @@ Copyright (C) 2013-2016 Xamarin. All rights reserved.
 			Prefix="monotouch"
 			NoOverwrite="@(_BundleResourceWithLogicalName)"
 			IntermediateOutputPath="$(DeviceSpecificIntermediateOutputPath)"
+			TargetFrameworkDirectory="$(TargetFrameworkDirectory)"
 			ReferencedLibraries="@(ReferencePath);@(ReferenceDependencyPaths)">
 			<Output TaskParameter="BundleResourcesWithLogicalNames" ItemName="_BundleResourceWithLogicalName" />
 		</UnpackLibraryResources>