diff --git a/doc/scripts/clint.sh b/doc/scripts/clint.sh
index 11b82c5..c9842e1 100755
--- a/doc/scripts/clint.sh
+++ b/doc/scripts/clint.sh
@@ -72,6 +72,8 @@ _clint()
 
 _clint_file()
 {
+	filename="$1"
+
 	echo
 	$DEBUG $LINT $CPPFLAGS $CFLAGS "$filename" 2>&1
 	ret=$?