diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c
index 354df42f2135..122817bc67dc 100644
--- a/sys/amd64/amd64/trap.c
+++ b/sys/amd64/amd64/trap.c
@@ -935,6 +935,6 @@ amd64_syscall(struct thread *td, int traced)
 	 * not be safe.  Instead, use the full return path which
 	 * catches the problem safely.
 	 */
-	if (td->td_frame->tf_rip >= VM_MAXUSER_ADDRESS)
+	if (__predict_false(td->td_frame->tf_rip >= VM_MAXUSER_ADDRESS))
 		set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
 }