1 files changed, 2 insertions, 0 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 cebf9e815a..e9bcce761f 100644
--- a/activesupport/lib/active_support/core_ext/hash/transform_values.rb
+++ b/activesupport/lib/active_support/core_ext/hash/transform_values.rb
@@ -5,6 +5,7 @@ class Hash
   #   { a: 1, b: 2, c: 3 }.transform_values { |x| x * 2 }
   #   # => { a: 2, b: 4, c: 6 }
   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