diff --git a/lisp/Config.NetBSD_gencgc b/lisp/Config.NetBSD_gencgc
index aed1949f55680662f9e177382a4dc09b591c24e0..efaa1d45a99fb2a0acd68fefdbb639e083858fa0 100644
--- a/lisp/Config.NetBSD_gencgc
+++ b/lisp/Config.NetBSD_gencgc
@@ -3,7 +3,7 @@ ARCH = $(shell uname -m)
 vpath %.h $(PATH1)
 vpath %.c $(PATH1)
 vpath %.S $(PATH1)
-CPPFLAGS = -I. -I$(PATH1) -I-
+CPPFLAGS = -iquote . -iquote $(PATH1)
 CC = gcc -pipe
 LD = ld
 CPP = cpp