diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 00d407fe071e5d2a2530203eca2c22f1121da99b..f4afbbef184e1b2ce92cbb15e04f9096fd3906de 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,11 +26,10 @@ doxygen:
     - documentation
   before_script:
     - apt-get update && apt-get install -y doxygen
-    - mkdir $(CI_PROJECT_DIR)/docs/modules
   script:
     - git clone -b feature-aircraftGeometry2 https://gitlab-ci-token:${CI_JOB_TOKEN}@git.rwth-aachen.de/unicado/libraries
     - cd libraries/aircraftGeometry2/doc/
-    - ( cat Doxyfile ; echo "OUTPUT_DIRECTORY = $(CI_PROJECT_DIR)/docs/modules/" ) | doxygen -
+    - ( cat Doxyfile ; echo "OUTPUT_DIRECTORY = $CI_PROJECT_DIR/docs/modules/" ) | doxygen -
   artifacts:
     paths:
       - $(CI_PROJECT_DIR)/docs/modules