diff --git a/voxpupuli-test.gemspec b/voxpupuli-test.gemspec
index 9400602..250751d 100644
--- a/voxpupuli-test.gemspec
+++ b/voxpupuli-test.gemspec
@@ -38,6 +38,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency 'puppet-lint-variable_contains_upcase'
   s.add_runtime_dependency 'puppet-lint-version_comparison-check'
   s.add_runtime_dependency 'puppet-lint-resource_reference_syntax'
+  s.add_runtime_dependency 'puppet-lint-manifest_whitespace-check'
 
   # development
   s.add_development_dependency 'rspec'