diff --git a/.github/workflows/latexdiff.yml b/.github/workflows/latexdiff.yml
index 99d7f2e..8c7c088 100644
--- a/.github/workflows/latexdiff.yml
+++ b/.github/workflows/latexdiff.yml
@@ -46,7 +46,7 @@ jobs:
           echo "📂 Listing files in base/latex:"
           ls -R
           echo "🔄 Flattening base/latex/main.tex..."
-          flatex --stdout main.tex > ../../diff_output/base_flat.tex
+          flatex main.tex ../../diff_output/base_flat.tex
           echo "✅ base_flat.tex preview:"
           head -n 50 ../../diff_output/base_flat.tex
 
@@ -56,7 +56,7 @@ jobs:
           echo "📂 Listing files in compare/latex:"
           ls -R
           echo "🔄 Flattening compare/latex/main.tex..."
-          flatex --stdout main.tex > ../../diff_output/compare_flat.tex
+          flatex main.tex ../../diff_output/compare_flat.tex
           echo "✅ compare_flat.tex preview:"
           head -n 50 ../../diff_output/compare_flat.tex