diff --git a/src/wp-admin/setup-config.php b/src/wp-admin/setup-config.php
index 9d6b8ffeb6..6274a1aa73 100644
--- a/src/wp-admin/setup-config.php
+++ b/src/wp-admin/setup-config.php
@@ -332,7 +332,7 @@ switch($step) {
 			continue;
 		}
 
-		if ( ! preg_match( '/^define\(\'([A-Z_]+)\',([ ]+)/', $line, $match ) )
+		if ( ! preg_match( '/^define\(\s*\'([A-Z_]+)\',([ ]+)/', $line, $match ) )
 			continue;
 
 		$constant = $match[1];
@@ -343,11 +343,11 @@ switch($step) {
 			case 'DB_USER'     :
 			case 'DB_PASSWORD' :
 			case 'DB_HOST'     :
-				$config_file[ $line_num ] = "define('" . $constant . "'," . $padding . "'" . addcslashes( constant( $constant ), "\\'" ) . "');\r\n";
+				$config_file[ $line_num ] = "define( '" . $constant . "'," . $padding . "'" . addcslashes( constant( $constant ), "\\'" ) . "' );\r\n";
 				break;
 			case 'DB_CHARSET'  :
 				if ( 'utf8mb4' === $wpdb->charset || ( ! $wpdb->charset && $wpdb->has_cap( 'utf8mb4' ) ) ) {
-					$config_file[ $line_num ] = "define('" . $constant . "'," . $padding . "'utf8mb4');\r\n";
+					$config_file[ $line_num ] = "define( '" . $constant . "'," . $padding . "'utf8mb4' );\r\n";
 				}
 				break;
 			case 'AUTH_KEY'         :
@@ -358,7 +358,7 @@ switch($step) {
 			case 'SECURE_AUTH_SALT' :
 			case 'LOGGED_IN_SALT'   :
 			case 'NONCE_SALT'       :
-				$config_file[ $line_num ] = "define('" . $constant . "'," . $padding . "'" . $secret_keys[$key++] . "');\r\n";
+				$config_file[ $line_num ] = "define( '" . $constant . "'," . $padding . "'" . $secret_keys[$key++] . "' );\r\n";
 				break;
 		}
 	}