diff --git a/src/coreclr/clrdefinitions.cmake b/src/coreclr/clrdefinitions.cmake
index 133d30d41e615d..c259077de0363a 100644
--- a/src/coreclr/clrdefinitions.cmake
+++ b/src/coreclr/clrdefinitions.cmake
@@ -152,7 +152,7 @@ if(FEATURE_OBJCMARSHAL)
   add_compile_definitions(FEATURE_OBJCMARSHAL)
 endif()
 
-# add_compile_definitions(FEATURE_RUNTIME_ASYNC)
+add_compile_definitions(FEATURE_RUNTIME_ASYNC)
 
 add_compile_definitions($<$<NOT:$<BOOL:$<TARGET_PROPERTY:DAC_COMPONENT>>>:FEATURE_PROFAPI_ATTACH_DETACH>)
 
diff --git a/src/tests/async/Directory.Build.targets b/src/tests/async/Directory.Build.targets
index 5a4d413a9e1f62..5501ea437bd2be 100644
--- a/src/tests/async/Directory.Build.targets
+++ b/src/tests/async/Directory.Build.targets
@@ -6,7 +6,7 @@
 
   <PropertyGroup>
     <!-- runtime async testing in main repo NYI -->
-    <DisableProjectBuild>true</DisableProjectBuild>
+    <!-- <DisableProjectBuild>true</DisableProjectBuild> -->
   </PropertyGroup>
 
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets, $(MSBuildThisFileDirectory)..))" />