diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.PackTool.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.PackTool.targets
index 775cbca2a40f..2f96be51bb60 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.PackTool.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.PackTool.targets
@@ -295,7 +295,7 @@ NOTE: This file is imported from the following contexts, so be aware when writin
       ApphostsForShimRuntimeIdentifiers="@(_ApphostsForShimRuntimeIdentifiers)"
       IntermediateAssembly="@(IntermediateAssembly->'%(FullPath)')"
       OutputType="$(OutputType)"
-      PackagedShimOutputDirectory="$([System.IO.Path]::Combine($(PackagedShimOutputRootDirectory), 'shims', $(_ToolPackShortTargetFrameworkName)))"
+      PackagedShimOutputDirectory="$([MSBuild]::NormalizeDirectory($(PackagedShimOutputRootDirectory), 'shims', $(_ToolPackShortTargetFrameworkName)))"
       PackageId="$(PackageId)"
       PackageVersion="$(PackageVersion)"
       ShimRuntimeIdentifiers="@(_PackAsToolShimRuntimeIdentifiers)"
@@ -324,7 +324,7 @@ NOTE: This file is imported from the following contexts, so be aware when writin
 
   <Target Name="_ComputeExpectedEmbeddedApphostPaths">
     <GetEmbeddedApphostPaths
-      PackagedShimOutputDirectory="$([System.IO.Path]::Combine($(PackagedShimOutputRootDirectory), 'shims', $(_ToolPackShortTargetFrameworkName)))"
+      PackagedShimOutputDirectory="$([MSBuild]::NormalizeDirectory($(PackagedShimOutputRootDirectory), 'shims', $(_ToolPackShortTargetFrameworkName)))"
       ShimRuntimeIdentifiers="@(_PackAsToolShimRuntimeIdentifiers)"
       ToolCommandName="$(ToolCommandName)">
 
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Publish.targets b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Publish.targets
index 1b78b5c95653..728f17b43132 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Publish.targets
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Publish.targets
@@ -1289,7 +1289,7 @@ Copyright (c) .NET Foundation. All rights reserved.
     </ItemGroup>
 
     <GetEmbeddedApphostPaths
-      PackagedShimOutputDirectory="$([System.IO.Path]::Combine($(PackagedShimOutputRootDirectory), 'shims', $(TargetFramework)))"
+      PackagedShimOutputDirectory="$([MSBuild]::NormalizeDirectory($(PackagedShimOutputRootDirectory), 'shims', $(TargetFramework)))"
       ShimRuntimeIdentifiers="@(_PackAsToolShimRuntimeIdentifiers)"
       ToolCommandName="$(ToolCommandName)"
       >