diff --git a/install/lib/installer_base.lib.php b/install/lib/installer_base.lib.php
index e7a664d644aa703228a92a745b211c4270a5c4de..363a38cb99e2d2799db8f0cc66a6c2c3ef3d3be6 100644
--- a/install/lib/installer_base.lib.php
+++ b/install/lib/installer_base.lib.php
@@ -263,7 +263,7 @@ class installer_base {
 		}
 
 		// Delete ISPConfig user in the local database, in case that it exists
-		$this->db->query("DROP USER ?'@'? ", $conf['mysql']['ispconfig_user'], $from_host);
+		$this->db->query("DROP USER ?@?", $conf['mysql']['ispconfig_user'], $from_host);
 		$this->db->query("DROP DATABASE IF EXISTS ?", $conf['mysql']['database']);
 
 		//* Create the ISPConfig database user in the local database