diff --git a/virtualmin-mailman-lib.pl b/virtualmin-mailman-lib.pl
index 669d0b6..bbf163c 100755
--- a/virtualmin-mailman-lib.pl
+++ b/virtualmin-mailman-lib.pl
@@ -344,7 +344,7 @@ sub delete_list
 &write_file($lists_file, \%lists);
 &unlock_file($lists_file);
 
-if (&get_postfix_version() >= 3) {
+if (&postfix::get_postfix_version() >= 3) {
 	# Regen Mailman-managed aliases
 	&system_logged("$mailman_cmd aliases >/dev/null 2>&1 </dev/null");
 	}