diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 8c0077fedb696faf6b4ca242c7aef4b439c97938..90f1f8a9eed5569cc0c21892efecaac4c14adc3d 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -6,6 +6,7 @@ build:
   tags: ["x64"]
   script:
     - echo $SHELL
+    - eval "$(micromamba shell hook --shell=bash)"
     - micromamba activate
     - sage -pip install "pseudowalls==0.0.3" --extra-index-url https://gitlab.com/api/v4/projects/43962374/packages/pypi/simple
     - make || echo make failed