diff --git a/lib/onebox/templates/githubcommit.mustache b/lib/onebox/templates/githubcommit.mustache
index bf563f772b9..5bac6c27123 100644
--- a/lib/onebox/templates/githubcommit.mustache
+++ b/lib/onebox/templates/githubcommit.mustache
@@ -15,7 +15,7 @@
 
       <div class="user">
         <a href="{{author.html_url}}" target="_blank" rel="noopener">
-          <img alt="{{author.login}}" src="{{author.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
+          <img alt="" src="{{author.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
           {{author.login}}
         </a>
       </div>
diff --git a/lib/onebox/templates/githubissue.mustache b/lib/onebox/templates/githubissue.mustache
index 05d542b2137..8f10f8b4cc0 100644
--- a/lib/onebox/templates/githubissue.mustache
+++ b/lib/onebox/templates/githubissue.mustache
@@ -21,7 +21,7 @@
 
       <div class="user">
         <a href="{{user.html_url}}" target="_blank" rel="noopener">
-          <img alt="{{user.login}}" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
+          <img alt="" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
           {{user.login}}
         </a>
       </div>
diff --git a/lib/onebox/templates/githubpullrequest.mustache b/lib/onebox/templates/githubpullrequest.mustache
index a87a90c5ec8..9bb3299bbcb 100644
--- a/lib/onebox/templates/githubpullrequest.mustache
+++ b/lib/onebox/templates/githubpullrequest.mustache
@@ -33,7 +33,7 @@
         <span>
           {{i18n.commit_by}}
           <a href="{{author.html_url}}" target="_blank" rel="noopener">
-            <img alt="{{author.login}}" src="{{author.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
+            <img alt="" src="{{author.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
             {{author.login}}
           </a> - <a href="{{link}}" target="_blank" rel="noopener">{{title}}</a>
         </span>
@@ -44,7 +44,7 @@
       <h4>
         {{i18n.comment_by}}
         <a href="{{user.html_url}}" target="_blank" rel="noopener">
-          <img alt="{{user.login}}" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
+          <img alt="" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
           {{user.login}}
         </a> - <a href="{{link}}" target="_blank" rel="noopener">{{title}}</a>
       </h4>
@@ -54,7 +54,7 @@
       <h4>
         {{i18n.review_by}}
         <a href="{{user.html_url}}" target="_blank" rel="noopener">
-          <img alt="{{user.login}}" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
+          <img alt="" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
           {{user.login}}
         </a> - <a href="{{link}}" target="_blank" rel="noopener">{{title}}</a>
       </h4>
@@ -78,7 +78,7 @@
 
         <div class="user">
           <a href="{{user.html_url}}" target="_blank" rel="noopener">
-            <img alt="{{user.login}}" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
+            <img alt="" src="{{user.avatar_url}}" class="onebox-avatar-inline" width="20" height="20">
             {{user.login}}
           </a>
         </div>