diff --git a/ha_mroonga.cpp b/ha_mroonga.cpp
index dd9967d..c105a62 100644
--- a/ha_mroonga.cpp
+++ b/ha_mroonga.cpp
@@ -7678,7 +7678,7 @@ grn_rc ha_mroonga::generic_ft_init_ext_prepare_expression_in_boolean_mode(
const char *keyword, *keyword_original;
uint keyword_length, keyword_length_original;
- grn_operator default_operator = GRN_OP_OR;
+ grn_operator default_operator = GRN_OP_ADJUST;
grn_bool weight_specified = false;
keyword = keyword_original = key->ptr();
keyword_length = keyword_length_original = key->length();
-
Kazuhiko Shiozaki authored37904d59