diff --git a/web_src/js/components/PullRequestMergeForm.vue b/web_src/js/components/PullRequestMergeForm.vue
index 9efa8840ac..7faa1823cb 100644
--- a/web_src/js/components/PullRequestMergeForm.vue
+++ b/web_src/js/components/PullRequestMergeForm.vue
@@ -138,7 +138,7 @@ export default {
 
     <div v-if="!showActionForm" class="tw-flex">
       <!-- the merge button -->
-      <div class="ui buttons merge-button" :class="[mergeForm.emptyCommit ? '' : mergeForm.allOverridableChecksOk ? 'primary' : 'red']" @click="toggleActionForm(true)">
+      <div v-if="!mergeForm.hasPendingPullRequestMerge" class="ui buttons merge-button" :class="[mergeForm.emptyCommit ? '' : mergeForm.allOverridableChecksOk ? 'primary' : 'red']" @click="toggleActionForm(true)">
         <button class="ui button">
           <svg-icon name="octicon-git-merge"/>
           <span class="button-text">