diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 45e184d1549f334d5f7ed4ef8c01a42e58c46ff8..d3ffca0919b93ad979ac053cde888d5396fa1a84 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -31,7 +31,7 @@ building_stage:
          - build/cluster/*
          - build/sphere/*
          - build/trapping/*
-	 - doc/build/*
+         - doc/build/*
       exclude:
          - ".git*"
          - ".git/**/*"