diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 33c564460..f24541239 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -72,6 +72,10 @@ jobs:
       - name: Run Windows tests
         if: matrix.name == 'Windows'
         run: dotnet test src --configuration Release --no-build --logger "GitHubActions;report-warnings=false"
+        env:
+          NServiceBus_AmazonSQS_AT_CustomFixedNamePrefix: CiWinATT
       - name: Run Linux tests
         if: matrix.name == 'Linux'
         run: dotnet test src --configuration Release --no-build --framework netcoreapp3.1 --logger "GitHubActions;report-warnings=false"
+        env:
+          NServiceBus_AmazonSQS_AT_CustomFixedNamePrefix: CiNixATT