diff --git a/CI/check_codegen.sh b/CI/check_codegen.sh
index b87bd005..918e303b 100755
--- a/CI/check_codegen.sh
+++ b/CI/check_codegen.sh
@@ -31,6 +31,8 @@ diff="$(git status --porcelain rust)"
 
 if [ ! -z "$diff" ]; then
     echo "The generated Rust files are not up-to-date"
+    echo "DIFF:"
+    echo "$diff"
     echo "You can regenerate them with './codegen/update.sh' and commit the changes"
     exit 1
 fi