diff --git a/spec/classes/blackbox_exporter_spec.rb b/spec/classes/blackbox_exporter_spec.rb
index 31be22f64..e0f3ecc34 100644
--- a/spec/classes/blackbox_exporter_spec.rb
+++ b/spec/classes/blackbox_exporter_spec.rb
@@ -14,8 +14,8 @@
             arch: 'amd64',
             os: 'linux',
             modules: {
-              "http_2xx" => {
-                "prober": "http"  
+              'http_2xx' => {
+                'prober' => 'http'
               }
             }
           }
@@ -26,7 +26,7 @@
         end
         describe 'config file contents' do
           it {
-            verify_contents(catalogue,'/etc/blackbox_exporter.yaml',['---','modules:','  http_2xx:','    prober: http'])
+            verify_contents(catalogue, '/etc/blackbox_exporter.yaml', ['---', 'modules:', '  http_2xx:', '    prober: http'])
           }
         end
       end