diff --git a/sys/arch/alpha/alpha/machdep.c b/sys/arch/alpha/alpha/machdep.c
index 555ab04d7d0c..23f99adc5fa6 100644
--- a/sys/arch/alpha/alpha/machdep.c
+++ b/sys/arch/alpha/alpha/machdep.c
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.262 2003/04/01 02:18:51 thorpej Exp $ */
+/* $NetBSD: machdep.c,v 1.263 2003/04/08 23:35:48 thorpej Exp $ */
 
 /*-
  * Copyright (c) 1998, 1999, 2000 The NetBSD Foundation, Inc.
@@ -75,7 +75,7 @@
 
 #include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
 
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.262 2003/04/01 02:18:51 thorpej Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.263 2003/04/08 23:35:48 thorpej Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -363,15 +363,13 @@ nobootinfo:
 	trap_init();
 
 	/*
-	 * find out this system's page size
-	 */
-	PAGE_SIZE = hwrpb->rpb_page_size;
-	if (PAGE_SIZE != 8192)
-		panic("page size %d != 8192?!", PAGE_SIZE);
-
-	/*
-	 * Initialize PAGE_SIZE-dependent variables.
+	 * Find out this system's page size, and initialize
+	 * PAGE_SIZE-dependent variables.
 	 */
+	if (hwrpb->rpb_page_size != ALPHA_PGBYTES)
+		panic("page size %lu != %d?!", hwrpb->rpb_page_size,
+		    ALPHA_PGBYTES);
+	uvmexp.pagesize = hwrpb->rpb_page_size;
 	uvm_setpagesize();
 
 	/*
diff --git a/sys/arch/alpha/include/vmparam.h b/sys/arch/alpha/include/vmparam.h
index 9bf048ce2931..a687ea4c8409 100644
--- a/sys/arch/alpha/include/vmparam.h
+++ b/sys/arch/alpha/include/vmparam.h
@@ -1,4 +1,4 @@
-/* $NetBSD: vmparam.h,v 1.25 2002/12/10 05:14:25 thorpej Exp $ */
+/* $NetBSD: vmparam.h,v 1.26 2003/04/08 23:35:48 thorpej Exp $ */
 
 /*
  * Copyright (c) 1988 University of Utah.
@@ -49,6 +49,14 @@
  * Machine dependent constants for Alpha.
  */
 
+/*
+ * All systypes currently supported by NetBSD/alpha have an 8K pages.
+ * Override the PAGE_* definitions to be compile-time constants.
+ */
+#define	PAGE_SHIFT	13
+#define	PAGE_SIZE	(1 << PAGE_SHIFT)
+#define	PAGE_MASK	(PAGE_SIZE - 1)
+
 /*
  * USRSTACK is the top (end) of the user stack.
  *
@@ -106,7 +114,7 @@
 #define VM_MAX_KERNEL_ADDRESS	trunc_page((vaddr_t)ALPHA_K1SEG_END)
 
 /* virtual sizes (bytes) for various kernel submaps */
-#define VM_PHYS_SIZE		(USRIOSIZE*NBPG)
+#define VM_PHYS_SIZE		(USRIOSIZE*PAGE_SIZE)
 
 /* some Alpha-specific constants */
 #define	VPTBASE		((vaddr_t)0xfffffffc00000000)	/* Virt. pg table */