diff --git a/lib/logstorage/parser.go b/lib/logstorage/parser.go
index 2ec250030f..ca4dcc45bf 100644
--- a/lib/logstorage/parser.go
+++ b/lib/logstorage/parser.go
@@ -840,7 +840,7 @@ func parseGenericFilter(lex *lexer, fieldName string) (filter, error) {
 		}
 		return f, nil
 	case lex.isKeyword("("):
-		if !lex.isSkippedSpace && !lex.isPrevToken("", ":", "(", "!", "not") {
+		if !lex.isSkippedSpace && !lex.isPrevToken("", ":", "(", "!", "-", "not") {
 			return nil, fmt.Errorf("missing whitespace before the search word %q", lex.prevToken)
 		}
 		return parseParensFilter(lex, fieldName)
diff --git a/lib/logstorage/parser_test.go b/lib/logstorage/parser_test.go
index 3593477047..36cf65da6c 100644
--- a/lib/logstorage/parser_test.go
+++ b/lib/logstorage/parser_test.go
@@ -646,6 +646,8 @@ func TestParseQuerySuccess(t *testing.T) {
 	f(`not(foo)`, `!foo`)
 	f(`not (foo)`, `!foo`)
 	f(`not ( foo or bar )`, `!(foo or bar)`)
+	f(`!(foo or bar)`, `!(foo or bar)`)
+	f(`-(foo or bar)`, `!(foo or bar)`)
 	f(`foo:!""`, `!foo:""`)
 	f("_msg:foo", "foo")
 	f("'foo:bar'", `"foo:bar"`)