diff --git a/eng/Versions.props b/eng/Versions.props
index 6e896fbe33b83c..07d8a86414addf 100644
--- a/eng/Versions.props
+++ b/eng/Versions.props
@@ -182,10 +182,11 @@
     <NetStandardLibraryVersion>2.0.3</NetStandardLibraryVersion>
     <MicrosoftDiagnosticsToolsRuntimeClientVersion>1.0.4-preview6.19326.1</MicrosoftDiagnosticsToolsRuntimeClientVersion>
     <DNNEVersion>2.0.5</DNNEVersion>
+    <!-- Intentionally using explicit versions for all MSBuild properties - required by source-build. -->
     <MicrosoftBuildVersion>17.8.3</MicrosoftBuildVersion>
-    <MicrosoftBuildTasksCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildTasksCoreVersion>
-    <MicrosoftBuildFrameworkVersion>$(MicrosoftBuildVersion)</MicrosoftBuildFrameworkVersion>
-    <MicrosoftBuildUtilitiesCoreVersion>$(MicrosoftBuildVersion)</MicrosoftBuildUtilitiesCoreVersion>
+    <MicrosoftBuildTasksCoreVersion>17.8.3</MicrosoftBuildTasksCoreVersion>
+    <MicrosoftBuildFrameworkVersion>17.8.3</MicrosoftBuildFrameworkVersion>
+    <MicrosoftBuildUtilitiesCoreVersion>17.8.3</MicrosoftBuildUtilitiesCoreVersion>
     <NugetFrameworksVersion>6.2.4</NugetFrameworksVersion>
     <NugetProjectModelVersion>6.2.4</NugetProjectModelVersion>
     <NugetPackagingVersion>6.2.4</NugetPackagingVersion>