diff --git a/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets b/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets
index 2e134e663a493b..ef9d3372f5ca92 100755
--- a/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets
+++ b/src/coreclr/nativeaot/BuildIntegration/Microsoft.NETCore.Native.targets
@@ -27,9 +27,10 @@ The .NET Foundation licenses this file to you under the MIT license.
     <IlcFrameworkNativePath Condition="'$(IlcPath)' != '' and '$(IlcFrameworkNativePath)' == ''">$(IlcPath)\framework\</IlcFrameworkNativePath>
     <IlcFrameworkNativePath Condition="'$(IlcFrameworkNativePath)' == '' and '$(IlcFrameworkPath)' != ''">$(IlcFrameworkPath)</IlcFrameworkNativePath>
     <IlcMibcPath Condition="'$(IlcPath)' != '' and '$(IlcMibcPath)' == ''">$(IlcPath)\mibc\</IlcMibcPath>
-    <TargetOS Condition="'$([MSBuild]::IsOSPlatform(Windows))' == 'true'">windows</TargetOS>
-    <TargetOS Condition="'$([MSBuild]::IsOSPlatform(OSX))' == 'true'">osx</TargetOS>
-    <TargetOS Condition="'$(TargetOS)' == ''">$(OS)</TargetOS>
+    <TargetOS Condition="$(RuntimeIdentifier.StartsWith('win'))">windows</TargetOS>
+    <TargetOS Condition="$(RuntimeIdentifier.StartsWith('osx'))">osx</TargetOS>
+    <TargetOS Condition="$(RuntimeIdentifier.StartsWith('freebsd'))">freebsd</TargetOS>
+    <TargetOS Condition="'$(TargetOS)' == ''">linux</TargetOS>
     <NativeDebugSymbols Condition="$(DebugSymbols) == 'true' or ($(DebugType) != 'none' and $(DebugType) != '')">true</NativeDebugSymbols>
     <!-- Workaround for https://github.com/dotnet/runtimelab/issues/771 -->
     <ErrorOnDuplicatePublishOutputFiles>false</ErrorOnDuplicatePublishOutputFiles>