format.diff

diff --git a/src/tools/fmt b/src/tools/fmt
index 86bd0a6e78..23fcaedb2e 100755
--- a/src/tools/fmt
+++ b/src/tools/fmt
@@ -65,7 +65,7 @@ files_to_format() {
 	# errors in the subshell
 	local _find_result
 	_find_result=$(find src/backend/gporca src/backend/gpopt src/include/gpopt -name .clang-format)
-	mapfile -t CLANG_FORMAT_CONFIG_FILES <<<$_find_result
+	mapfile -t CLANG_FORMAT_CONFIG_FILES <<<"$_find_result"
 
 	local -a CF_DIRS PATTERNS
 	CF_DIRS=("${CLANG_FORMAT_CONFIG_FILES[@]%/*}")