diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 4da7813a8a..67259c04f7 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -79,12 +79,14 @@ jobs:
             - name: Build
               shell: pwsh
               run: ./ci-build.ps1 "${{matrix.options.framework}}"
+              env:
+                SIXLABORS_TESTING: True
 
             - name: Test
               shell: pwsh
               run: ./ci-test.ps1 "${{matrix.options.os}}" "${{matrix.options.framework}}" "${{matrix.options.runtime}}" "${{matrix.options.codecov}}"
               env:
-                  CI: True
+                  SIXLABORS_TESTING: True
                   XUNIT_PATH: .\tests\ImageSharp.Tests # Required for xunit
 
             - name: Export Failed Output
diff --git a/src/ImageSharp/ImageSharp.csproj b/src/ImageSharp/ImageSharp.csproj
index 6a7f7a600d..ca6ca16898 100644
--- a/src/ImageSharp/ImageSharp.csproj
+++ b/src/ImageSharp/ImageSharp.csproj
@@ -15,7 +15,7 @@
   </PropertyGroup>
 
   <Choose>
-    <When Condition="$(CI) == true">
+    <When Condition="$(SIXLABORS_TESTING) == true">
       <PropertyGroup>
         <TargetFrameworks>net5.0;netcoreapp3.1;netcoreapp2.1;netstandard2.1;netstandard2.0;netstandard1.3;net472</TargetFrameworks>
       </PropertyGroup>