diff --git a/src/userprog/Make.vars b/src/userprog/Make.vars
index 0f129f9..9db3cfa 100644
--- a/src/userprog/Make.vars
+++ b/src/userprog/Make.vars
@@ -4,4 +4,4 @@ os.dsk: DEFINES = -DUSERPROG -DFILESYS
 KERNEL_SUBDIRS = threads devices lib lib/kernel userprog filesys
 TEST_SUBDIRS = tests/userprog tests/userprog/no-vm tests/filesys/base
 GRADING_FILE = $(SRCDIR)/tests/userprog/Grading
-SIMULATOR = --bochs
+SIMULATOR = --qemu