diff --git a/sys/sys/proc.h b/sys/sys/proc.h
index 3f06cee70f4d..400855c87379 100644
--- a/sys/sys/proc.h
+++ b/sys/sys/proc.h
@@ -425,7 +425,6 @@ int	suser_xxx __P((struct ucred *cred, struct proc *proc, int flag));
 void	remrunqueue __P((struct proc *));
 void	cpu_switch __P((struct proc *));
 void	unsleep __P((struct proc *));
-void	wakeup_one __P((void *chan));
 
 void	cpu_exit __P((struct proc *)) __dead2;
 void	exit1 __P((struct proc *, int)) __dead2;
diff --git a/sys/sys/systm.h b/sys/sys/systm.h
index 3016cfeaac41..ffbd1ce0a591 100644
--- a/sys/sys/systm.h
+++ b/sys/sys/systm.h
@@ -288,6 +288,7 @@ int	tsleep __P((void *chan, int pri, const char *wmesg, int timo));
 int	asleep __P((void *chan, int pri, const char *wmesg, int timo));
 int	await  __P((int pri, int timo));
 void	wakeup __P((void *chan));
+void	wakeup_one __P((void *chan));
 
 /*
  * Common `dev_t' stuff are declared here to avoid #include poisoning