Index: typo3/sysext/install/mod/class.tx_install.php
===================================================================
--- typo3/sysext/install/mod/class.tx_install.php	(revision 9758)
+++ typo3/sysext/install/mod/class.tx_install.php	(working copy)
@@ -288,7 +288,15 @@
 		$this->mode = t3lib_div::_GP('mode');
 		if ($this->mode !== '123') {
 			$this->mode = '';
-		} else {
+		}
+
+			// Let DBAL decide whether to load itself
+		$dbalLoaderFile = $this->backPath . 'sysext/dbal/class.tx_dbal_autoloader.php';
+		if (@is_file($dbalLoaderFile)) {
+			include($dbalLoaderFile);
+		}
+
+		if ($this->mode === '123') {
 				// Check for mandatory PHP modules
 			$missingPhpModules = $this->getMissingPhpModules();
 			if (count($missingPhpModules) > 0) {
@@ -321,12 +329,6 @@
 			$this->INSTALL['type'] = 'database';
 		}
 
-			// Let DBAL decide whether to load itself
-		$dbalLoaderFile = $this->backPath . 'sysext/dbal/class.tx_dbal_autoloader.php';
-		if (@is_file($dbalLoaderFile)) {
-			include($dbalLoaderFile);
-		}
-
 			// Hook to raise the counter for the total steps in the 1-2-3 installer
 		if (is_array ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install/mod/class.tx_install.php']['additionalSteps'])) {
 			foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['ext/install/mod/class.tx_install.php']['additionalSteps'] as $classData) {