diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2fe366a821edc884a06b9e9f4c05ce95a407dcfb..7f851da0afc56af9a2b5fd74ebe61ed67c471189 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -228,7 +228,6 @@ gcc_7_serial_dbg:
       WALBERLA_BUILD_WITH_OPENMP: "OFF"
       WALBERLA_BUILD_WITH_PARMETIS: "OFF"
       CMAKE_BUILD_TYPE: "DebugOptimized"
-      WALBERLA_ENABLE_GUI: "ON"
    only:
       variables:
          - $ENABLE_NIGHTLY_BUILDS