diff --git a/.github/workflows/ci_dbt_core_testing.yml b/.github/workflows/ci_dbt_core_testing.yml
index e96ec8b5..5d6faade 100644
--- a/.github/workflows/ci_dbt_core_testing.yml
+++ b/.github/workflows/ci_dbt_core_testing.yml
@@ -241,7 +241,7 @@ jobs:
         if: runner.os == 'Windows'
         run: |
           python -m venv env
-          source env\Scripts\activate
+          source env\Scripts\Activate.ps1
 
       - name: "Set up & activate venv (not windows!)"
         if: runner.os != 'Windows'