diff --git a/.github/workflows/check_notebooks.yml b/.github/workflows/check_notebooks.yml
index 1d8f384..ca2d40c 100644
--- a/.github/workflows/check_notebooks.yml
+++ b/.github/workflows/check_notebooks.yml
@@ -54,5 +54,5 @@
     
           - name: Run notebooks
             run: |
-              find . -name "*.ipynb" -exec sed -E -i .bak "s/num_epochs=.?.?/num_epochs=1/g" {} +
+              find . -name "*.ipynb" -exec sed -E -i bak -e "s/num_epochs=.?.?/num_epochs=1/g" {} +
               find . -name "*.ipynb" -exec jupyter execute {} +
\ No newline at end of file