diff --git a/lisp/Config.parisc_mach b/lisp/Config.parisc_mach
index 1497982e07d589519bd2d92bbd6478bd5809b4d6..7aa7fee2ad7b4c5d32b56e7eb3ab5d6db557f0be 100644
--- a/lisp/Config.parisc_mach
+++ b/lisp/Config.parisc_mach
@@ -5,7 +5,7 @@ CC = /usr/src/mach/bin/cc
 NM = hacks/my-nm
 CFLAGS = -g
 ASFLAGS = -g
-UNDEFSYMPATTERN = &
+UNDEFSYMPATTERN=-u &
 ASSEM_SRC = hppa-assem.S
 ARCH_SRC = hppa-arch.c
 OS_SRC = mach-os.c