diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index dd86cc8b2e1db83989eb7dae424761134f72c4be..5eac29929d61ca687af62dabfa13d75d241e39bd 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -3,7 +3,7 @@ stages:
 
 before_script:
     - apt-get update
-    - apt-get -y install build-essential make autoconf gcc
+    - apt-get -y install build-essential make autoconf gcc gnuplot
     - make
 
 test: