diff --git a/ArchiSteamFarm/ArchiSteamFarm.csproj b/ArchiSteamFarm/ArchiSteamFarm.csproj
index 8b3c5d9f7..eab33532f 100644
--- a/ArchiSteamFarm/ArchiSteamFarm.csproj
+++ b/ArchiSteamFarm/ArchiSteamFarm.csproj
@@ -79,16 +79,16 @@
 		</Content>
 	</ItemGroup>
 
-	<ItemGroup Condition="Exists("overlay\os\$(ASFVariant.Split('-')[0])")">
-		<Content Include="overlay\os\$(ASFVariant.Split('-')[0])\**\*.*">
+	<ItemGroup Condition="Exists($([System.IO.Path]::Combine('overlay', 'os', $(ASFVariant.Split('-')[0]))))">
+		<Content Include="overlay/os/$(ASFVariant.Split('-')[0])/**/*.*">
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 			<ExcludeFromSingleFile>true</ExcludeFromSingleFile>
 			<Link>%(RecursiveDir)%(Filename)%(Extension)</Link>
 		</Content>
 	</ItemGroup>
 
-	<ItemGroup Condition="Exists("overlay\variant\$(ASFVariant)")">
-		<Content Include="overlay\variant\$(ASFVariant)\**\*.*">
+	<ItemGroup Condition="Exists($([System.IO.Path]::Combine('overlay', 'variant', $(ASFVariant))))">
+		<Content Include="overlay/variant/$(ASFVariant)/**/*.*">
 			<CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
 			<ExcludeFromSingleFile>true</ExcludeFromSingleFile>
 			<Link>%(RecursiveDir)%(Filename)%(Extension)</Link>