diff --git a/extras/custom_checks.sh b/extras/custom_checks.sh
index 9ae088714..1d5b498c2 100644
--- a/extras/custom_checks.sh
+++ b/extras/custom_checks.sh
@@ -72,7 +72,7 @@ function check_do_not_use_builtin_random_in_tests() {
 }
 
 function check_deprecated_typing() {
-	if grep -R '\<typing .*\<import .*\<\(Tuple\|List\|Dict\|Set\|FrozenSet\|AbstractSet\|DefaultDict\|OrderedDict\)\>' "${SOURCE_DIRS[@]}"; then
+	if grep -RI '\<typing .*\<import .*\<\(Tuple\|List\|Dict\|Set\|FrozenSet\|AbstractSet\|DefaultDict\|OrderedDict\)\>' "${SOURCE_DIRS[@]}"; then
 		echo 'do not use typing.List/Tuple/Dict/... for type annotations use builtin list/tuple/dict/... instead'
 		echo 'for more info check the PEP 585 doc: https://peps.python.org/pep-0585/'
 		return 1