diff --git a/web_src/js/components/PullRequestMergeForm.vue b/web_src/js/components/PullRequestMergeForm.vue
index 29ed42620d51a..08b1f9cb86e90 100644
--- a/web_src/js/components/PullRequestMergeForm.vue
+++ b/web_src/js/components/PullRequestMergeForm.vue
@@ -48,7 +48,7 @@
 
     <div v-if="!showActionForm" class="df">
       <!-- the merge button -->
-      <div class="ui buttons merge-button" :class="[mergeForm.emptyCommit?'grey':mergeForm.allOverridableChecksOk?'green':'red']" @click="toggleActionForm(true)" >
+      <div class="ui buttons merge-button" :class="[mergeForm.emptyCommit ? 'grey' : mergeForm.allOverridableChecksOk ? 'green' : 'red']" @click="toggleActionForm(true)" >
         <button class="ui button">
           <svg-icon name="octicon-git-merge"/>
           <span class="button-text">