diff --git a/lib/power_assert.rb b/lib/power_assert.rb
index 8de209e..035e0a9 100644
--- a/lib/power_assert.rb
+++ b/lib/power_assert.rb
@@ -28,7 +28,6 @@ module PowerAssert
 
   class << self
     def start(assertion_proc_or_source, assertion_method: nil, source_binding: TOPLEVEL_BINDING)
-      clear_global_method_cache
       yield Context.new(assertion_proc_or_source, assertion_method, source_binding)
     end
 
@@ -48,16 +47,5 @@ def internal_file?(file)
         file.start_with?(dir)
       end
     end
-
-    CLEAR_CACHE_ISEQ = RubyVM::InstructionSequence.compile('using PowerAssert.const_get(:Empty)')
-    private_constant :CLEAR_CACHE_ISEQ
-
-    def clear_global_method_cache
-      CLEAR_CACHE_ISEQ.eval
-    end
-  end
-
-  module Empty
   end
-  private_constant :Empty
 end
diff --git a/test/block_test.rb b/test/block_test.rb
index cd43a62..6b903e1 100644
--- a/test/block_test.rb
+++ b/test/block_test.rb
@@ -351,19 +351,17 @@ def inspect; '#<Class>'; end
       end
     end
 
-    if PowerAssert.respond_to?(:clear_global_method_cache, true)
-      t do
-        3.times do
-          assert_equal <<END.chomp, assertion_message {
-            String == Array
-            |      |  |
-            |      |  Array
-            |      false
-            String
+    t do
+      3.times do
+        assert_equal <<END.chomp, assertion_message {
+          String == Array
+          |      |  |
+          |      |  Array
+          |      false
+          String
 END
-            String == Array
-          }
-        end
+          String == Array
+        }
       end
     end
   end