diff --git a/install/lib/installer_base.lib.php b/install/lib/installer_base.lib.php
index e95c3e3e9c56f22342eed710ba387a7f74c6e9ef..ab49b6753efa1a3bd11dfe9beec6309a3b48d531 100644
--- a/install/lib/installer_base.lib.php
+++ b/install/lib/installer_base.lib.php
@@ -968,7 +968,7 @@ class installer_base {
 		}
 
 		//* Get postfix version
-		exec('postfix -d mail_version 2>&1', $out);
+		exec('postconf -d mail_version 2>&1', $out);
 		$postfix_version = preg_replace('/.*=\s*/', '', $out[0]);
 		unset($out);