diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 018ac13d9a7a42075bc659140c4ab66387baf8b1..f8220f9a15b0e00fe5f22c3ec7860fc86d5feca2 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -5,7 +5,7 @@ variables:
 
 before_script:
   - apt-get update --yes
-  - apt-get install --yes cmake libboost-dev libeigen3-dev python3
+  - apt-get install --yes cmake libboost-dev libeigen3-dev python3 gfortran
 
 build:
   stage: build