diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 78b4b9f..949a7a1 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -26,7 +26,7 @@ build-job:       # This job runs in the build stage, which runs first.
     - linux
   before_script:
     - apt update
-    - apt install -y cmake libgtkmm-3.0-dev
+    - apt install -y build-essential cmake libgtkmm-3.0-dev
   script:
     - echo "Configuring"
     - cmake -B build .