diff --git a/src/Directory.Build.props b/src/Directory.Build.props
index 23f9e733920..e21487d217e 100644
--- a/src/Directory.Build.props
+++ b/src/Directory.Build.props
@@ -19,7 +19,9 @@
     <!-- The default is Embed -->
     <VBRuntime>Default</VBRuntime>
     <RemoveIntegerChecks>true</RemoveIntegerChecks>
-    <LangVersion>15.5</LangVersion>
+
+    <!-- This doesn't work in WPF projects (during their `tmp_proj` build). -->
+    <!-- <LangVersion>15.5</LangVersion> -->
   </PropertyGroup>
 
   <PropertyGroup>