diff --git a/lib/private/Setup/PostgreSQL.php b/lib/private/Setup/PostgreSQL.php
index 4f4f8a03231..085e8609ab2 100644
--- a/lib/private/Setup/PostgreSQL.php
+++ b/lib/private/Setup/PostgreSQL.php
@@ -60,7 +60,7 @@ class PostgreSQL extends AbstractDatabase {
 				//use the admin login data for the new database user
 
 				//add prefix to the postgresql user name to prevent collisions
-				$this->dbUser = 'oc_' . $username;
+				$this->dbUser = 'oc_' . strtolower($username);
 				//create a new password so we don't need to store the admin config in the config file
 				$this->dbPassword = \OC::$server->getSecureRandom()->generate(30, \OCP\Security\ISecureRandom::CHAR_LOWER . \OCP\Security\ISecureRandom::CHAR_DIGITS);
 
@@ -111,7 +111,7 @@ class PostgreSQL extends AbstractDatabase {
 	private function createDatabase(IDBConnection $connection) {
 		if (!$this->databaseExists($connection)) {
 			//The database does not exists... let's create it
-			$query = $connection->prepare("CREATE DATABASE \"" . addslashes($this->dbName) . "\" OWNER '" . addslashes($this->dbUser) . "'");
+			$query = $connection->prepare("CREATE DATABASE " . addslashes($this->dbName) . " OWNER " . addslashes($this->dbUser));
 			try {
 				$query->execute();
 			} catch (DatabaseException $e) {
@@ -119,7 +119,7 @@ class PostgreSQL extends AbstractDatabase {
 				$this->logger->logException($e);
 			}
 		} else {
-			$query = $connection->prepare("REVOKE ALL PRIVILEGES ON DATABASE \"" . addslashes($this->dbName) . "\" FROM PUBLIC");
+			$query = $connection->prepare("REVOKE ALL PRIVILEGES ON DATABASE " . addslashes($this->dbName) . " FROM PUBLIC");
 			try {
 				$query->execute();
 			} catch (DatabaseException $e) {
@@ -153,10 +153,10 @@ class PostgreSQL extends AbstractDatabase {
 		try {
 			if ($this->userExists($connection)) {
 				// change the password
-				$query = $connection->prepare("ALTER ROLE \"" . addslashes($this->dbUser) . "\" WITH CREATEDB PASSWORD '" . addslashes($this->dbPassword) . "'");
+				$query = $connection->prepare("ALTER ROLE " . addslashes($this->dbUser) . " WITH CREATEDB PASSWORD '" . addslashes($this->dbPassword) . "'");
 			} else {
 				// create the user
-				$query = $connection->prepare("CREATE USER \"" . addslashes($this->dbUser) . "\" CREATEDB PASSWORD '" . addslashes($this->dbPassword) . "'");
+				$query = $connection->prepare("CREATE USER " . addslashes($this->dbUser) . " CREATEDB PASSWORD '" . addslashes($this->dbPassword) . "'");
 			}
 			$query->execute();
 		} catch (DatabaseException $e) {