diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index 444b18d2f3..7c9ceb6b90 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -36,9 +36,11 @@ pub const (
 	valid_comptime_not_user_defined  = all_valid_comptime_idents()
 	array_builtin_methods            = ['filter', 'clone', 'repeat', 'reverse', 'map', 'slice',
 		'sort', 'contains', 'index', 'wait', 'any', 'all', 'first', 'last', 'pop']
+	array_builtin_methods_chk        = token.new_keywords_matcher_from_array_trie(array_builtin_methods)
 	// TODO: remove `byte` from this list when it is no longer supported
 	reserved_type_names              = ['byte', 'bool', 'char', 'i8', 'i16', 'int', 'i64', 'u8',
 		'u16', 'u32', 'u64', 'f32', 'f64', 'map', 'string', 'rune']
+	reserved_type_names_chk          = token.new_keywords_matcher_from_array_trie(reserved_type_names)
 	vroot_is_deprecated_message      = '@VROOT is deprecated, use @VMODROOT or @VEXEROOT instead'
 )
 
diff --git a/vlib/v/checker/fn.v b/vlib/v/checker/fn.v
index c182e9e6e3..3994c403c5 100644
--- a/vlib/v/checker/fn.v
+++ b/vlib/v/checker/fn.v
@@ -1154,7 +1154,7 @@ pub fn (mut c Checker) method_call(mut node ast.CallExpr) ast.Type {
 	}
 	// TODO: remove this for actual methods, use only for compiler magic
 	// FIXME: Argument count != 1 will break these
-	if left_sym.kind == .array && method_name in array_builtin_methods {
+	if left_sym.kind == .array && array_builtin_methods_chk.matches(method_name) {
 		return c.array_builtin_method_call(mut node, left_type, c.table.sym(left_type))
 	} else if (left_sym.kind == .map || final_left_sym.kind == .map)
 		&& method_name in ['clone', 'keys', 'values', 'move', 'delete'] {