diff --git a/htdocs/install/step1.php b/htdocs/install/step1.php
index 7235e564275..24b5dba4d01 100644
--- a/htdocs/install/step1.php
+++ b/htdocs/install/step1.php
@@ -199,6 +199,14 @@ if (!empty($main_url) && substr($main_url, dol_strlen($main_url) - 1) == "/") {
 	$main_url = substr($main_url, 0, dol_strlen($main_url) - 1);
 }
 
+if (!dol_is_dir($main_dir.'/core/db/')) {
+	print '<div class="error">'.$langs->trans("ErrorBadValueForParameter", $main_dir, $langs->transnoentitiesnoconv("WebPagesDirectory")).'</div>';
+	print '<br>';
+	//print $langs->trans("BecauseConnectionFailedParametersMayBeWrong").'<br><br>';
+	print $langs->trans("ErrorGoBackAndCorrectParameters");
+	$error++;
+}
+
 // Test database connection
 if (!$error) {
 	$result = @include_once $main_dir."/core/db/".$db_type.'.class.php';