diff --git a/sys/kern/uipc_usrreq.c b/sys/kern/uipc_usrreq.c
index 598080171ab2..fdf3d902509f 100644
--- a/sys/kern/uipc_usrreq.c
+++ b/sys/kern/uipc_usrreq.c
@@ -1468,7 +1468,7 @@ unp_pcblist(SYSCTL_HANDLER_ARGS)
 		break;
 
 	default:
-		panic("unp_pcblist: arg1 %d", (intptr_t)arg1);
+		panic("unp_pcblist: arg1 %d", (int)(intptr_t)arg1);
 	}
 
 	/*