1 files changed, 3 insertions, 1 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/transform_values.rb b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
index 6ff7e91212..e9bcce761f 100644
--- a/activesupport/lib/active_support/core_ext/hash/transform_values.rb
+++ b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
@@ -4,7 +4,8 @@ class Hash
   #
   #   { a: 1, b: 2, c: 3 }.transform_values { |x| x * 2 }
   #   # => { a: 2, b: 4, c: 6 }
-  def transform_values(&block)
+  def transform_values
+    return enum_for(:transform_values) unless block_given?
     result = self.class.new
     each do |key, value|
       result[key] = yield(value)
@@ -14,6 +15,7 @@ class Hash
 
   # Destructive +transform_values+
   def transform_values!
+    return enum_for(:transform_values!) unless block_given?
     each do |key, value|
       self[key] = yield(value)
     end