diff --git a/build/Targets/Settings.targets b/build/Targets/Settings.targets
index 42a00a806ffab59110940e6d80d90fba6f837296..6398b3f3fac248e52ac611947587a0496418ca1e 100644
--- a/build/Targets/Settings.targets
+++ b/build/Targets/Settings.targets
@@ -135,6 +135,8 @@
   <PropertyGroup>
     <IsVSBeforeDev15Preview4 Condition="'$(OS)' == 'Windows_NT' AND '$(registry:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\VisualStudio\15.0@InstallDir)' != ''">true</IsVSBeforeDev15Preview4>
     <IsVSBeforeDev15Preview4 Condition="'$(OS)' == 'Windows_NT' AND '$(registry:HKEY_LOCAL_MACHINE\SOFTWARE\WOW6432Node\Microsoft\VisualStudio\15.0@InstallDir)' != ''">true</IsVSBeforeDev15Preview4>
+    <IsVSBeforeDev15Preview4 Condition="'$(IsVSBeforeDev15Preview4)' == 'true' AND Exists('$(MSBuildBinPath)\..\..\..\Common7\IDE\devenv.isolation.ini')">false</IsVSBeforeDev15Preview4>
+    <IsVSBeforeDev15Preview4 Condition="'$(IsVSBeforeDev15Preview4)' == 'true' AND Exists('$(MSBuildBinPath)\..\..\..\..\Common7\IDE\devenv.isolation.ini')">false</IsVSBeforeDev15Preview4>
   </PropertyGroup>
 
   <Choose>