diff --git a/test/rbs/ast/visitor_test.rb b/test/rbs/ast/visitor_test.rb
index 6ecdfdb91..2f781f53c 100644
--- a/test/rbs/ast/visitor_test.rb
+++ b/test/rbs/ast/visitor_test.rb
@@ -63,7 +63,7 @@ def visit_member_method_definition(node)
 
   def parse_rbs_string(rbs)
     rbs = RBS::Buffer.new(content: rbs, name: "-")
-    buffer, directives, declarations = RBS::Parser.parse_signature(rbs)
+    _, _, declarations = RBS::Parser.parse_signature(rbs)
     declarations
   end
 end