diff --git a/installer/data/mysql/atomicupdate/bug-27783.pl b/installer/data/mysql/atomicupdate/bug-27783.pl
index 7fee204990..1f17eb6ea5 100644
--- a/installer/data/mysql/atomicupdate/bug-27783.pl
+++ b/installer/data/mysql/atomicupdate/bug-27783.pl
@@ -7,14 +7,19 @@ return {
         my ($args) = @_;
         my ($dbh, $out) = @$args{qw(dbh out)};
 
-        $dbh->do(q{
-            ALTER TABLE `background_jobs`
-            ADD `queue` VARCHAR(191) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'default' COMMENT 'Name of the queue the job is sent to' AFTER `type`
-        });
-        $dbh->do(q{
-            ALTER TABLE `background_jobs`
-            ADD KEY `queue` (`queue`)
-        });
+        unless ( column_exists( 'background_jobs', 'queue' ) ) {
+            $dbh->do(q{
+                ALTER TABLE `background_jobs`
+                ADD COLUMN `queue` VARCHAR(191) COLLATE utf8mb4_unicode_ci NOT NULL DEFAULT 'default' COMMENT 'Name of the queue the job is sent to' AFTER `type`
+            });
+        }
+
+        unless ( index_exists( 'background_jobs', 'queue' ) ) {
+            $dbh->do(q{
+                ALTER TABLE `background_jobs`
+                ADD KEY `queue` (`queue`)
+            });
+        }
 
         say $out "Added background_jobs.queue";
     },