diff --git a/format.sh b/format.sh
index 7c7285a97..5776d74ef 100755
--- a/format.sh
+++ b/format.sh
@@ -45,6 +45,7 @@ then
         echo "Suggested change:"
         cp -r src clang_format_src
         $CLANG_FORMAT -style=file -i clang_format_src/*.c clang_format_src/*.h
+        cp src/iscygpty.[ch] clang_format_src
         diff -ur src clang_format_src
         rm -r clang_format_src
         echo "Run '$0 reformat' to fix formatting"