diff --git a/src/Workspaces/Core/Portable/Workspaces.csproj b/src/Workspaces/Core/Portable/Workspaces.csproj
index cf90188c6311b0c4fca682f43af449823d084ed8..9661ee862126db1a6e0df407ba960c3798d8850a 100644
--- a/src/Workspaces/Core/Portable/Workspaces.csproj
+++ b/src/Workspaces/Core/Portable/Workspaces.csproj
@@ -13,6 +13,8 @@
     <TargetFrameworkVersion>v5.0</TargetFrameworkVersion>
     <ProjectTypeGuids>{786C830F-07A1-408B-BD7F-6EE04809D6DB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <ServiceablePackage>true</ServiceablePackage>
+    <!-- Temporary workaround for CLR bug, VSO #290723. Please remove the below line once this bug is fixed. -->
+    <SkipApplyOptimizations>true</SkipApplyOptimizations>
   </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\..\Compilers\Core\Portable\CodeAnalysis.csproj">