diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 33da99c..424f4a9 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -31,7 +31,12 @@ tests:
     - python -m pip install --extra-index-url https://gitlab.com/api/v4/projects/27624814/packages/pypi/simple --extra-index-url https://pip.grassrootseconomics.net:8433 install -r requirements.txt -r test_requirements.txt
     - python -m pip freeze
     - ls
-    - export PYTHONPATH=.
+    - > 
+      if [ -z $PYTHONPATH ]; then
+        export PYTHONPATH=.
+      else
+        export PYTHONPATH=$PYTHONPATH:.
+      fi
     - PYTHONPATH=. bash run_tests.sh 
 
   only: