diff --git a/app/assets/javascripts/admin/models/admin_user.js b/app/assets/javascripts/admin/models/admin_user.js
index 31d8eed77..c76df0099 100644
--- a/app/assets/javascripts/admin/models/admin_user.js
+++ b/app/assets/javascripts/admin/models/admin_user.js
@@ -9,11 +9,26 @@
 Discourse.AdminUser = Discourse.User.extend({
 
   deleteAllPosts: function() {
-    var user = this;
     this.set('can_delete_all_posts', false);
-    Discourse.ajax("/admin/users/" + (this.get('id')) + "/delete_all_posts", {type: 'PUT'}).then(function(result){
-      user.set('post_count', 0);
-    });
+    var user = this;
+    var message = I18n.t('admin.user.delete_all_posts_confirm', {posts: user.get('post_count'), topics: user.get('topic_count')});
+    var buttons = [{
+      "label": I18n.t("composer.cancel"),
+      "class": "cancel",
+      "link":  true,
+      "callback": function() {
+        user.set('can_delete_all_posts', true);
+      }
+    }, {
+      "label": '<i class="icon icon-warning-sign"></i> ' + I18n.t("admin.user.delete_all_posts"),
+      "class": "btn btn-danger",
+      "callback": function() {
+        Discourse.ajax("/admin/users/" + (user.get('id')) + "/delete_all_posts", {type: 'PUT'}).then(function(result){
+          user.set('post_count', 0);
+        });
+      }
+    }];
+    bootbox.dialog(message, buttons, {"classes": "delete-all-posts"});
   },
 
   // Revoke the user's admin access
@@ -248,13 +263,13 @@ Discourse.AdminUser = Discourse.User.extend({
       "class": "cancel",
       "link":  true
     }, {
-      "label": I18n.t('admin.user.delete_dont_block'),
+      "label": '<i class="icon icon-warning-sign"></i> ' + I18n.t('admin.user.delete_dont_block'),
       "class": "btn",
       "callback": function(){
         performDestroy(false);
       }
     }, {
-      "label": I18n.t('admin.user.delete_and_block'),
+      "label": '<i class="icon icon-warning-sign"></i> ' + I18n.t('admin.user.delete_and_block'),
       "class": "btn",
       "callback": function(){
         performDestroy(true);
@@ -272,7 +287,7 @@ Discourse.AdminUser = Discourse.User.extend({
       "class": "cancel",
       "link":  true
     }, {
-      "label": I18n.t("flagging.yes_delete_spammer"),
+      "label": '<i class="icon icon-warning-sign"></i> ' + I18n.t("flagging.yes_delete_spammer"),
       "class": "btn btn-danger",
       "callback": function() {
         Discourse.ajax("/admin/users/" + user.get('id') + '.json', {
diff --git a/app/assets/stylesheets/application/modal.css.scss b/app/assets/stylesheets/application/modal.css.scss
index b55012430..7292b81d9 100644
--- a/app/assets/stylesheets/application/modal.css.scss
+++ b/app/assets/stylesheets/application/modal.css.scss
@@ -313,7 +313,7 @@
   }
 }
 
-.flagging-delete-spammer {
+.flagging-delete-spammer, .delete-all-posts {
   .modal-footer .cancel {
     text-decoration: underline;
     margin-left: 10px;
diff --git a/config/locales/client.en.yml b/config/locales/client.en.yml
index 09400690e..f32c27ac3 100644
--- a/config/locales/client.en.yml
+++ b/config/locales/client.en.yml
@@ -1247,6 +1247,7 @@ en:
         unban_failed: "Something went wrong unbanning this user {{error}}"
         ban_duration: "How long would you like to ban the user for? (days)"
         delete_all_posts: "Delete all posts"
+        delete_all_posts_confirm: "You are about to delete %{posts} posts and %{topics} topics. Are you sure?"
         ban: "Ban"
         unban: "Unban"
         banned: "Banned?"