1 files changed, 2 insertions, 1 deletions

diff --git a/Makefile.build b/Makefile.build
index e68e721..4854124 100644
--- a/Makefile.build
+++ b/Makefile.build
@@ -62,7 +62,8 @@ userprog_SRC += userprog/gdt.c		# GDT initialization.
 userprog_SRC += userprog/tss.c          # TSS management.
 
 # No virtual memory code yet.
-vm_SRC = vm/page.c
+vm_SRC  = vm/page.c
+vm_SRC += vm/mmap.c
 
 # Filesystem code.
 filesys_SRC  = filesys/filesys.c        # Filesystem core.