diff --git a/test/irb/helper.rb b/test/irb/helper.rb
index bbdb16eed0..e281b8e2f6 100644
--- a/test/irb/helper.rb
+++ b/test/irb/helper.rb
@@ -87,6 +87,10 @@ module TestIRB
         omit "Integration tests require PTY."
       end
 
+      if ruby_core?
+        omit "This test works only under ruby/irb"
+      end
+
       @envs = {}
     end
 
diff --git a/test/irb/test_debug_cmd.rb b/test/irb/test_debug_cmd.rb
index d4cd87c750..35239364ba 100644
--- a/test/irb/test_debug_cmd.rb
+++ b/test/irb/test_debug_cmd.rb
@@ -10,10 +10,6 @@ module TestIRB
     def setup
       super
 
-      if ruby_core?
-        omit "This test works only under ruby/irb"
-      end
-
       if RUBY_ENGINE == 'truffleruby'
         omit "This test runs with ruby/debug, which doesn't work with truffleruby"
       end
diff --git a/test/irb/test_history.rb b/test/irb/test_history.rb
index 489ae2f3af..39f9e82750 100644
--- a/test/irb/test_history.rb
+++ b/test/irb/test_history.rb
@@ -210,14 +210,6 @@ module TestIRB
   end
 
   class NestedIRBHistoryTest < IntegrationTestCase
-    def setup
-      super
-
-      if ruby_core?
-        omit "This test works only under ruby/irb"
-      end
-    end
-
     def test_history_saving_with_nested_sessions
       write_history ""