diff --git a/src/libraries/oob-all.proj b/src/libraries/oob-all.proj
index 7974fa370604b0..1754c8b3d8a70c 100644
--- a/src/libraries/oob-all.proj
+++ b/src/libraries/oob-all.proj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.Build.Traversal">
 
-  <PropertyGroup Condition="'$(BuildTargetFramework)' == '$(NetFrameworkCurrent)'">
+  <PropertyGroup Condition="'$(BuildTargetFramework)' != '' and '$(BuildTargetFramework)' == '$(NetFrameworkCurrent)'">
     <TargetFramework>$(BuildTargetFramework)</TargetFramework>
     <!-- Filter ProjectReferences to build the best matching target framework only. -->
     <FilterTraversalProjectReferences>true</FilterTraversalProjectReferences>