diff --git a/src/sys/kernel/Makefile b/src/sys/kernel/Makefile
index df1ad28..74a4617 100755
--- a/src/sys/kernel/Makefile
+++ b/src/sys/kernel/Makefile
@@ -14,7 +14,7 @@
 REMOVE = rm -fr
 
 #  Objects
-OBJS = io.o version.o kprintf.o vsprintf.o idt.o schedule.o exec.o dma.o idlethread.o syscall.o fork.o kmalloc.o
+OBJS = io.o version.o kprintf.o vsprintf.o idt.o schedule.o exec.o dma.o idlethread.o syscall.o fork.o kmalloc.o spinlock.o
 
 all: $(OBJS)