diff --git a/core/Migrations/Version18000Date20190920085628.php b/core/Migrations/Version18000Date20190920085628.php
index 96fcfc7ab8..0e83855d55 100644
--- a/core/Migrations/Version18000Date20190920085628.php
+++ b/core/Migrations/Version18000Date20190920085628.php
@@ -60,7 +60,9 @@ class Version18000Date20190920085628 extends SimpleMigrationStep {
 			$table->addColumn('displayname', Types::STRING, [
 				'notnull' => true,
 				'length' => 255,
-				'default' => '',
+				// Will be overwritten in postSchemaChange, but Oracle can not save
+				// empty strings in notnull columns
+				'default' => 'name',
 			]);
 		}