diff --git a/commands/mdb/Makefile b/commands/mdb/Makefile
index f419d759c..3b28461ef 100644
--- a/commands/mdb/Makefile
+++ b/commands/mdb/Makefile
@@ -19,7 +19,7 @@ STACK		=200000
 #
 # (2) If kernel and mm are not in "/usr/src" change this
 #
-SYSTEM	=$(USR)/src
+SYSTEM	=../..
 #
 # (3) Select Options
 #