diff --git a/Directory.Build.props b/Directory.Build.props
index e21d7f07ef7f0..c3809e2ce3299 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,4 +1,4 @@
-<Project>
+<Project TreatAsLocalProperty="RepoRoot">
 
   <PropertyGroup>
     <!--
@@ -20,7 +20,7 @@
 
   <!-- Set these properties early enough for libraries as they import the Arcade SDK not early enough.  -->
   <PropertyGroup Condition="'$(SkipImportArcadeSdkFromRoot)' == 'true'">
-    <RepoRoot>$(MSBuildThisFileDirectory)</RepoRoot>
+    <RepoRoot>$([MSBuild]::EnsureTrailingSlash('$(MSBuildThisFileDirectory)'))</RepoRoot>
     <RepositoryEngineeringDir>$([MSBuild]::NormalizeDirectory('$(RepoRoot)', 'eng'))</RepositoryEngineeringDir>
     <ArtifactsDir>$([MSBuild]::NormalizeDirectory('$(RepoRoot)', 'artifacts'))</ArtifactsDir>
     <ArtifactsBinDir>$([MSBuild]::NormalizeDirectory('$(ArtifactsDir)', 'bin'))</ArtifactsBinDir>