diff --git a/elftools.gemspec b/elftools.gemspec
index 14c0b1a..1c8a826 100644
--- a/elftools.gemspec
+++ b/elftools.gemspec
@@ -29,4 +29,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rubocop', '~> 1'
   s.add_development_dependency 'simplecov', '~> 0.21'
   s.add_development_dependency 'yard', '~> 0.9'
+  s.metadata['rubygems_mfa_required'] = 'true'
 end
diff --git a/spec/elf_file_spec.rb b/spec/elf_file_spec.rb
index b895f9c..6f948fd 100644
--- a/spec/elf_file_spec.rb
+++ b/spec/elf_file_spec.rb
@@ -44,7 +44,7 @@
 
     it 'data' do
       expect(@elf.section_by_name('.note.gnu.build-id').data)
-        .to eq "\x04\x00\x00\x00\x14\x00\x00\x00\x03\x00\x00\x00"\
+        .to eq "\x04\x00\x00\x00\x14\x00\x00\x00\x03\x00\x00\x00" \
                "GNU\x00s\xABb\xCB{\xC9\x95\x9C\xE0S\xC2\xB7\x112!Xp\x8C\xDC\a"
     end