diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 2478b79..2e53e32 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -9,7 +9,7 @@ before_script:
 build-pdf:
     stage: pdf
     script:
-        - "for i in `ls *.tex`; do pdflatex -synctex=1 -interaction=nonstopmode '$i'; done"
+        - "for i in `ls *.tex`; do pdflatex -synctex=1 -interaction=nonstopmode \"$i\"; done"
     artifacts:
         paths:
             - "*.pdf"