diff --git a/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems b/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
index 1f353b4c78455a..1fba187315a8c6 100644
--- a/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
+++ b/src/libraries/System.Private.CoreLib/src/System.Private.CoreLib.Shared.projitems
@@ -2750,7 +2750,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\LowLevelLifoSemaphore.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\LowLevelLifoSemaphore.Windows.cs" Condition="'$(TargetsWindows)' == 'true'" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\PreAllocatedOverlapped.Windows.cs" Condition="'$(TargetsWindows)' == 'true'" />
-    <Compile Include="$(MSBuildThisFileDirectory)System\Threading\PreAllocatedOverlapped.Unix.cs" Condition="'$(TargetsUnix)' == 'true'" />
+    <Compile Include="$(MSBuildThisFileDirectory)System\Threading\PreAllocatedOverlapped.Unix.cs" Condition="'$(TargetsUnix)' == 'true' or ('$(TargetsBrowser)' == 'true' and '$(FeatureWasmManagedThreads)' == 'true')" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\PreAllocatedOverlapped.Portable.cs" Condition="('$(TargetsBrowser)' != 'true' and '$(TargetsWasi)' != 'true') or '$(FeatureWasmManagedThreads)' == 'true'" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\RegisteredWaitHandle.Windows.cs" Condition="'$(TargetsWindows)' == 'true'" />
     <Compile Include="$(MSBuildThisFileDirectory)System\Threading\RegisteredWaitHandle.Unix.cs" Condition="'$(TargetsWindows)' != 'true'" />