diff --git a/lib/jsonapi/rspec/id.rb b/lib/jsonapi/rspec/id.rb
index 504df38..150379b 100644
--- a/lib/jsonapi/rspec/id.rb
+++ b/lib/jsonapi/rspec/id.rb
@@ -3,7 +3,7 @@ module RSpec
     module Id
       ::RSpec::Matchers.define :have_id do |expected|
         match do |actual|
-          JSONAPI::RSpec.as_indifferent_hash(actual)['id'] == expected
+          JSONAPI::RSpec.as_indifferent_hash(actual)['id'] == expected.to_s
         end
       end
     end
diff --git a/spec/jsonapi/id_spec.rb b/spec/jsonapi/id_spec.rb
index 96a42d0..d4e296e 100644
--- a/spec/jsonapi/id_spec.rb
+++ b/spec/jsonapi/id_spec.rb
@@ -5,6 +5,10 @@
     expect('id' => 'foo').to have_id('foo')
   end
 
+  it 'succeeds when expectation is integer' do
+    expect('id' => '123').to have_id(123)
+  end
+
   it 'fails when id mismatches' do
     expect('id' => 'foo').not_to have_id('bar')
   end