diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 35a7dd7e7..21fcbf262 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -37,10 +37,10 @@ jobs:
           python -m black src/gt4sd --check --diff --color
       - name: Remove unnecessary files (see https://stackoverflow.com/questions/75536771/github-runner-out-of-disk-space-after-building-docker-image)
         run: |
-        sudo rm -rf /usr/share/dotnet
-        sudo rm -rf /opt/ghc
-        sudo rm -rf "/usr/local/share/boost"
-        sudo rm -rf "$AGENT_TOOLSDIRECTORY"
+          sudo rm -rf /usr/share/dotnet
+          sudo rm -rf /opt/ghc
+          sudo rm -rf "/usr/local/share/boost"
+          sudo rm -rf "$AGENT_TOOLSDIRECTORY"
       - name: Check flake8
         run: |
           conda activate gt4sd