diff --git a/.github/workflows/python-app.yml b/.github/workflows/python-app.yml
index cadb460..90b5e05 100644
--- a/.github/workflows/python-app.yml
+++ b/.github/workflows/python-app.yml
@@ -29,7 +29,7 @@ jobs:
       run: |
         for file in pdf-files/*.pdf; do
           filename=$(basename "$file".pdf)
-          if [! -f "pdf-files/${filename}.pptx" ]; then
+          if [ ! -f "pdf-files/${filename}.pptx" ]; then
             pdf2pptx "$file"
           fi
         done