diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5adc3c65..451f626c 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,7 +1,7 @@
 image: rust:latest
 
 before_script:
-  - apt-get update -qq && apt-get install -y -qq libdbus-1-dev libclang-dev libudev-dev libfontconfig1-dev
+  - apt-get update -qq && apt-get install -y -qq libdbus-1-dev libclang-dev libudev-dev libfontconfig1-dev libgtk-3-dev
 
 stages:
     - test
@@ -26,4 +26,3 @@ build:
 
 variables:
   GIT_SUBMODULE_STRATEGY: normal
-