diff --git a/sys/arch/alpha/include/Makefile.inc b/sys/arch/alpha/include/Makefile.inc
index cf1e6fd6da2f..5fc336726fe7 100644
--- a/sys/arch/alpha/include/Makefile.inc
+++ b/sys/arch/alpha/include/Makefile.inc
@@ -1,3 +1,8 @@
-# $NetBSD: Makefile.inc,v 1.1 1999/03/10 06:41:48 ross Exp $
+# $NetBSD: Makefile.inc,v 1.2 2001/10/05 15:25:02 simonb Exp $
+
+.if !defined(_ALPHA_MAKEFILE_INC)
+_ALPHA_MAKEFILE_INC=	yes
 
 CFLAGS += -mno-fp-regs
+
+.endif