diff --git a/lib/rspec/support/differ.rb b/lib/rspec/support/differ.rb
index b2afa688..fcc9bfd0 100644
--- a/lib/rspec/support/differ.rb
+++ b/lib/rspec/support/differ.rb
@@ -58,20 +58,26 @@ def diff_as_string(actual, expected)
       end
       # rubocop:enable Metrics/MethodLength
 
-      def diff_hashes_as_object(actual, expected)
-        if defined?(RSpec::Mocks::ArgumentMatchers::AnyArgMatcher)
-          expected_to_diff =
-            expected.reduce({}) do |hash, (key, value)|
-              if RSpec::Mocks::ArgumentMatchers::AnyArgMatcher === value
-                hash[key] = actual[key]
-              else
-                hash[key] = expected[key]
+      if defined?(RSpec::Mocks::ArgumentMatchers::AnyArgMatcher)
+        def diff_hashes_as_object(actual, expected)
+          if defined?(RSpec::Mocks::ArgumentMatchers::AnyArgMatcher)
+            expected_to_diff =
+              expected.reduce({}) do |hash, (key, value)|
+                if RSpec::Mocks::ArgumentMatchers::AnyArgMatcher === value
+                  hash[key] = actual[key]
+                else
+                  hash[key] = expected[key]
+                end
+                hash
               end
-              hash
-            end
 
-          diff_as_object(actual, expected_to_diff)
-        else
+            diff_as_object(actual, expected_to_diff)
+          else
+            diff_as_object(actual, expected)
+          end
+        end
+      else
+        def diff_hashes_as_object(actual, expected)
           diff_as_object(actual, expected)
         end
       end