diff --git a/gcc/config/i386/x-isc3 b/gcc/config/i386/x-isc3
index f11d270778a..527cca8132b 100644
--- a/gcc/config/i386/x-isc3
+++ b/gcc/config/i386/x-isc3
@@ -2,4 +2,3 @@ CLIB = -lPW
 # One person said it needs -DPOSIX_JC, but daa@CERF.NET says no.
 X_CFLAGS = -D_SYSV3 -Xp
 ENQUIRE_LDFLAGS = $(LDFLAGS)
-INSTALL_HEADERS_DIR = install-headers-cpio