diff --git a/src/SourceBuild/content/Directory.Build.props b/src/SourceBuild/content/Directory.Build.props
index 6ee6eae87..6f391ec35 100644
--- a/src/SourceBuild/content/Directory.Build.props
+++ b/src/SourceBuild/content/Directory.Build.props
@@ -57,7 +57,7 @@
 
     <!-- Source-only builds are non portable, except for cross-builds.
          Source-only cross-builds default to the portable configuration so the resulting SDK works on a wider range of distros. -->
-    <PortableBuild Condition="'$(PortableBuild)' == '' and '$(DotNetBuildSourceOnly)' == 'true' and '$(HostArchitecture)' == '$(TargetArchitecture)'">false</PortableBuild>
+    <PortableBuild Condition="'$(PortableBuild)' == '' and '$(DotNetBuildSourceOnly)' == 'true' and '$(BuildArchitecture)' == '$(TargetArchitecture)'">false</PortableBuild>
     <PortableBuild Condition="'$(PortableBuild)' == ''">true</PortableBuild>
 
     <PortableRid Condition="'$(__PortableTargetOS)' != ''">$(__PortableTargetOS)-$(TargetArchitecture)</PortableRid>