diff --git a/spec/rspec/support_spec.rb b/spec/rspec/support_spec.rb
index c759962b..477a63d5 100644
--- a/spec/rspec/support_spec.rb
+++ b/spec/rspec/support_spec.rb
@@ -22,7 +22,8 @@ def foo
       http_request_class = Struct.new(:method, :uri)
 
       proxy_class = Struct.new(:original) do
-        undef :=~, :method
+        undef :=~ if respond_to?(:=~)
+        undef :method if respond_to?(:method)
         def method_missing(name, *args, &block)
           original.__send__(name, *args, &block)
         end
@@ -39,12 +40,12 @@ def method_missing(name, *args, &block)
       end
 
       it 'fetches method definitions for proxy objects' do
-        object = proxy_class.new([])
+        object = proxy_class.new('abc')
         expect(Support.method_handle_for(object, :=~)).to be_a Method
       end
 
       it 'fetches method definitions for proxy objects' do
-        object = proxy_class.new([])
+        object = proxy_class.new('abc')
         expect(Support.method_handle_for(object, :=~)).to be_a Method
       end