diff --git a/src/Interactive/csi/csi.csproj b/src/Interactive/csi/csi.csproj
index 3970bb4e9ea38..e96beb550d24b 100644
--- a/src/Interactive/csi/csi.csproj
+++ b/src/Interactive/csi/csi.csproj
@@ -6,6 +6,7 @@
     <OutputType>Exe</OutputType>
     <RootNamespace>CSharpInteractive</RootNamespace>
     <TargetFrameworks>netcoreapp3.1;net472</TargetFrameworks>
+    <UseAppHost Condition="'$(DotNetBuildFromSource)' == 'true'">false</UseAppHost>
   </PropertyGroup>
   <ItemGroup Label="Project References">
     <ProjectReference Include="..\..\Compilers\Core\Portable\Microsoft.CodeAnalysis.csproj" />
diff --git a/src/Interactive/vbi/vbi.vbproj b/src/Interactive/vbi/vbi.vbproj
index 5bbdf7f03a798..5f732d7153419 100644
--- a/src/Interactive/vbi/vbi.vbproj
+++ b/src/Interactive/vbi/vbi.vbproj
@@ -6,6 +6,7 @@
     <OutputType>Exe</OutputType>
     <StartupObject>Sub Main</StartupObject>
     <TargetFrameworks>netcoreapp3.1;net472</TargetFrameworks>
+    <UseAppHost Condition="'$(DotNetBuildFromSource)' == 'true'">false</UseAppHost>
     <RootNamespace></RootNamespace>
   </PropertyGroup>
   <ItemGroup Label="Project References">