diff --git a/defs.h b/defs.h
index dca91bb..f2724ad 100644
--- a/defs.h
+++ b/defs.h
@@ -101,6 +101,7 @@ int             kill(int);
 void            pinit(void);
 void            procdump(void);
 void            scheduler(void) __attribute__((noreturn));
+void            sched(void);
 void            sleep(void*, struct spinlock*);
 void            userinit(void);
 int             wait(void);
diff --git a/proc.c b/proc.c
index 8197377..a72ec6c 100644
--- a/proc.c
+++ b/proc.c
@@ -17,6 +17,8 @@ int nextpid = 1;
 extern void forkret(void);
 extern void trapret(void);
 
+static void wakeup1(void *chan);
+
 void
 pinit(void)
 {