diff --git a/test/irb/test_completion.rb b/test/irb/test_completion.rb
index cb6da5b1f2..b23f73ea30 100644
--- a/test/irb/test_completion.rb
+++ b/test/irb/test_completion.rb
@@ -26,12 +26,6 @@ module TestIRB
       assert_empty(IRB::InputCompletor.retrieve_completion_data("1i.positi", bind: binding))
     end
 
-    def test_complete_symbol
-      :aiueo
-      assert_include(IRB::InputCompletor.retrieve_completion_data(":a", bind: binding), ":aiueo")
-      assert_empty(IRB::InputCompletor.retrieve_completion_data(":abcdefg", bind: binding))
-    end
-
     def test_complete_symbol_failure
       assert_nil(IRB::InputCompletor::PerfectMatchedProc.(":aiueo", bind: binding))
     end