diff --git a/Changelog.md b/Changelog.md
index 93cfe8bb..91636bed 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,6 +1,7 @@
 # Master (unreleased)
 
 * Add mutation from `Hash#[]` to `Hash#key?` (#511)
+* Add mutation from `Hash#fetch` to `Hash#key?` (#511)
 
 # v0.8.8 2015-xx-xx
 
diff --git a/lib/mutant/mutator/node/send.rb b/lib/mutant/mutator/node/send.rb
index 2506b3ba..2646b8dd 100644
--- a/lib/mutant/mutator/node/send.rb
+++ b/lib/mutant/mutator/node/send.rb
@@ -27,6 +27,7 @@ module Mutant
           to_a:          %i[to_ary],
           to_h:          %i[to_hash],
           at:            %i[fetch],
+          fetch:         %i[key?],
           :[] =>         %i[at fetch key?],
           :== =>         %i[eql? equal?],
           :>= =>         %i[> == eql? equal?],
diff --git a/meta/send.rb b/meta/send.rb
index 4e7a37ed..ba005e0b 100644
--- a/meta/send.rb
+++ b/meta/send.rb
@@ -359,6 +359,15 @@ Mutant::Meta::Example.add do
   mutation 'foo(nil)'
 end
 
+Mutant::Meta::Example.add do
+  source 'self.fetch(nil)'
+
+  singleton_mutations
+  mutation 'self.fetch'
+  mutation 'fetch(nil)'
+  mutation 'self.key?(nil)'
+end
+
 Unparser::Constants::KEYWORDS.each do |keyword|
   Mutant::Meta::Example.add do
     source "foo.#{keyword}(nil)"