diff --git a/.github/actions/tests-module-hydrodyn/action.yml b/.github/actions/tests-module-hydrodyn/action.yml
index 3d38ce96c4..a58e130c0f 100644
--- a/.github/actions/tests-module-hydrodyn/action.yml
+++ b/.github/actions/tests-module-hydrodyn/action.yml
@@ -4,6 +4,6 @@ author: 'Rafael Mudafort https://github.com/rafmudaf'
 runs:
   using: "composite"
   steps:  
-    - run: ctest -VV -j2 -R hd_ -LE python
+    - run: ctest -VV -j1 -R hd_ -LE python
       working-directory: ${{runner.workspace}}/openfast/build
       shell: bash