diff --git a/src/libsys/Makefile b/src/libsys/Makefile
index b271cf8..f906bf8 100644
--- a/src/libsys/Makefile
+++ b/src/libsys/Makefile
@@ -5,7 +5,7 @@
 # DEBUGGER = {gdb, mips, rom}
 
 BOARD ?= ml402
-TLB ?= no
+WITH_TLB ?= n
 ENDIANESS ?= eb
 DEBUGGER ?= mips