diff --git a/app/controllers/admin_controller.rb b/app/controllers/admin_controller.rb
index 8387a70329..8b42f1782b 100644
--- a/app/controllers/admin_controller.rb
+++ b/app/controllers/admin_controller.rb
@@ -15,7 +15,7 @@ def promote_admin
         flash[:error] = 'Only admins can promote other users to admins.'
       end
     end
-    redirect_to '/profile/' + @user.username + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{@user.username}?_=#{Time.now.to_i}"
   end
 
   def promote_moderator
@@ -29,7 +29,7 @@ def promote_moderator
         flash[:error] = 'Only moderators can promote other users.'
       end
     end
-    redirect_to '/profile/' + @user.username + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{@user.username}?_=#{Time.now.to_i}"
   end
 
   def demote_basic
@@ -43,7 +43,7 @@ def demote_basic
         flash[:error] = 'Only admins and moderators can demote other users.'
       end
     end
-    redirect_to '/profile/' + @user.username + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{@user.username}?_=#{Time.now.to_i}"
   end
 
   def reset_user_password
@@ -280,7 +280,7 @@ def moderate
     else
       flash[:error] = 'Only moderators can moderate other users.'
     end
-    redirect_to '/profile/' + user.name + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{user.name}?_=#{Time.now.to_i}"
   end
 
   def unmoderate
@@ -291,7 +291,7 @@ def unmoderate
     else
       flash[:error] = 'Only moderators can unmoderate other users.'
     end
-    redirect_to '/profile/' + user.name + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{user.name}?_=#{Time.now.to_i}"
   end
 
   def ban
@@ -301,7 +301,7 @@ def ban
     else
       flash[:error] = 'Only moderators can ban other users.'
     end
-    redirect_to '/profile/' + user.name + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{user.name}?_=#{Time.now.to_i}"
   end
 
   def unban
@@ -312,7 +312,7 @@ def unban
     else
       flash[:error] = 'Only moderators can unban other users.'
     end
-    redirect_to '/profile/' + user.name + '?_=' + Time.now.to_i.to_s
+    redirect_to "/profile/#{user.name}?_=#{Time.now.to_i}"
   end
 
   def users
@@ -359,7 +359,7 @@ def migrate
     else
       flash[:error] = 'Only admins can migrate users.'
     end
-    redirect_to '/profile/' + du.name
+    redirect_to "/profile/#{du.name}"
   end
 
   def queue