diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c
index f895c68798b6..d19e19a75847 100644
--- a/sys/kern/kern_exit.c
+++ b/sys/kern/kern_exit.c
@@ -530,9 +530,6 @@ exit1(struct thread *td, int rval, int signo)
 	PROC_LOCK(p);
 	p->p_xthread = td;
 
-	/* Tell the prison that we are gone. */
-	prison_proc_free(p->p_ucred->cr_prison);
-
 #ifdef KDTRACE_HOOKS
 	/*
 	 * Tell the DTrace fasttrap provider about the exit if it
@@ -603,6 +600,9 @@ exit1(struct thread *td, int rval, int signo)
 		PROC_LOCK(p->p_pptr);
 	sx_xunlock(&proctree_lock);
 
+	/* Tell the prison that we are gone. */
+	prison_proc_free(p->p_ucred->cr_prison);
+
 	/*
 	 * The state PRS_ZOMBIE prevents other proesses from sending
 	 * signal to the process, to avoid memory leak, we free memory