diff --git a/src/Compilers/CSharp/csc/App.config b/src/Compilers/CSharp/csc/App.config
index 15481f0b84175..0b8bc41dc17f4 100644
--- a/src/Compilers/CSharp/csc/App.config
+++ b/src/Compilers/CSharp/csc/App.config
@@ -2,6 +2,9 @@
 <!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 
 <configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
+  </startup>
   <runtime>
     <gcServer enabled="true" />
     <gcConcurrent enabled="false"/>
diff --git a/src/Compilers/Server/VBCSCompiler/App.config b/src/Compilers/Server/VBCSCompiler/App.config
index 8b142580b9e39..7db1af7cfaef3 100644
--- a/src/Compilers/Server/VBCSCompiler/App.config
+++ b/src/Compilers/Server/VBCSCompiler/App.config
@@ -2,6 +2,9 @@
 <!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 
 <configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
+  </startup>
   <runtime>
     <gcServer enabled="true"/>
     <gcConcurrent enabled="false"/>
diff --git a/src/Compilers/VisualBasic/vbc/App.config b/src/Compilers/VisualBasic/vbc/App.config
index 15481f0b84175..0b8bc41dc17f4 100644
--- a/src/Compilers/VisualBasic/vbc/App.config
+++ b/src/Compilers/VisualBasic/vbc/App.config
@@ -2,6 +2,9 @@
 <!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
 
 <configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
+  </startup>
   <runtime>
     <gcServer enabled="true" />
     <gcConcurrent enabled="false"/>
diff --git a/src/Interactive/csi/App.config b/src/Interactive/csi/App.config
new file mode 100644
index 0000000000000..442bfd2d9b621
--- /dev/null
+++ b/src/Interactive/csi/App.config
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
+
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
+  </startup>
+</configuration>
diff --git a/src/Interactive/csi/csi.csproj b/src/Interactive/csi/csi.csproj
index d9201fa99e705..ed6b8a2b4942d 100644
--- a/src/Interactive/csi/csi.csproj
+++ b/src/Interactive/csi/csi.csproj
@@ -34,6 +34,7 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <None Include="App.config" />
     <None Include="csi.rsp">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
     </None>
diff --git a/src/Interactive/vbi/App.config b/src/Interactive/vbi/App.config
new file mode 100644
index 0000000000000..442bfd2d9b621
--- /dev/null
+++ b/src/Interactive/vbi/App.config
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<!-- Copyright (c)  Microsoft.  All Rights Reserved.  Licensed under the Apache License, Version 2.0.  See License.txt in the project root for license information. -->
+
+<configuration>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6" />
+  </startup>
+</configuration>
diff --git a/src/Interactive/vbi/vbi.vbproj b/src/Interactive/vbi/vbi.vbproj
index a0564aa98f7c1..96953215f84d4 100644
--- a/src/Interactive/vbi/vbi.vbproj
+++ b/src/Interactive/vbi/vbi.vbproj
@@ -34,6 +34,7 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <None Include="App.config" />
     <None Include="project.json" />
     <None Include="vbi.rsp">
       <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>