diff --git a/src/Tasks/Microsoft.NET.Build.Extensions.Tasks/Microsoft.NET.Build.Extensions.Tasks.csproj b/src/Tasks/Microsoft.NET.Build.Extensions.Tasks/Microsoft.NET.Build.Extensions.Tasks.csproj
index 2cf417f30c96..11a24a8c8fed 100644
--- a/src/Tasks/Microsoft.NET.Build.Extensions.Tasks/Microsoft.NET.Build.Extensions.Tasks.csproj
+++ b/src/Tasks/Microsoft.NET.Build.Extensions.Tasks/Microsoft.NET.Build.Extensions.Tasks.csproj
@@ -10,6 +10,7 @@
     <PackageId>Microsoft.NET.Build.Extensions</PackageId>
     <RootNamespace>Microsoft.NET.Build.Tasks</RootNamespace>
     <TargetFrameworks>netcoreapp2.0;net46</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(DotNetBuildFromSource)' == 'true' ">netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup>
diff --git a/src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj b/src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj
index 2c52c7010313..d03639e77b0e 100644
--- a/src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj
+++ b/src/Tasks/Microsoft.NET.Build.Tasks/Microsoft.NET.Build.Tasks.csproj
@@ -7,6 +7,7 @@
     <OutputType>Library</OutputType>
     <PackageId>Microsoft.NET.Sdk</PackageId>
     <TargetFrameworks>netcoreapp2.0;net46</TargetFrameworks>
+    <TargetFrameworks Condition=" '$(DotNetBuildFromSource)' == 'true' ">netcoreapp2.0</TargetFrameworks>
   </PropertyGroup>
 
   <PropertyGroup>