diff --git a/make.h b/make.h
index 8475efa3..dd790705 100644
--- a/make.h
+++ b/make.h
@@ -57,7 +57,8 @@ extern int errno;
 
 /* Some systems define _POSIX_VERSION but are not really POSIX.1.  */
 #if (defined (butterfly) || \
-     (defined (__mips) && defined (_SYSTYPE_SVR3)))
+     (defined (__mips) && defined (_SYSTYPE_SVR3)) || \
+     (defined (sequent) && defined (i386)))
 #undef POSIX
 #endif