diff --git a/xCAT-server/lib/xcat/plugins/aixinstall.pm b/xCAT-server/lib/xcat/plugins/aixinstall.pm
index 471772899..6b03b3b3b 100644
--- a/xCAT-server/lib/xcat/plugins/aixinstall.pm
+++ b/xCAT-server/lib/xcat/plugins/aixinstall.pm
@@ -401,7 +401,7 @@ ll~;
 		# set the NIM install method (rte or mksysb)
         my $method="rte";
         if ($imagehash{$image_name}{nimmethod} ) {
-            $type = $imagehash{$image_name}{nimmethod};
+            $method = $imagehash{$image_name}{nimmethod};
         }
         chomp $method;