diff --git a/sys/dev/agp/agp.c b/sys/dev/agp/agp.c
index ccd7f517fbc3..95642acd6c03 100644
--- a/sys/dev/agp/agp.c
+++ b/sys/dev/agp/agp.c
@@ -55,7 +55,6 @@ __FBSDID("$FreeBSD$");
 #include <vm/vm_pageout.h>
 #include <vm/pmap.h>
 
-#include <machine/md_var.h>
 #include <machine/bus.h>
 #include <machine/resource.h>
 #include <sys/rman.h>
@@ -234,7 +233,7 @@ agp_generic_attach(device_t dev)
 	 * Work out an upper bound for agp memory allocation. This
 	 * uses a heurisitc table from the Linux driver.
 	 */
-	memsize = ptoa(Maxmem) >> 20;
+	memsize = ptoa(realmem) >> 20;
 	for (i = 0; i < agp_max_size; i++) {
 		if (memsize <= agp_max[i][0])
 			break;
diff --git a/sys/dev/agp/agp_i810.c b/sys/dev/agp/agp_i810.c
index c0f592ce97fb..54ddfdccbcb0 100644
--- a/sys/dev/agp/agp_i810.c
+++ b/sys/dev/agp/agp_i810.c
@@ -74,7 +74,6 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/bus.h>
 #include <machine/resource.h>
-#include <machine/md_var.h>
 #include <sys/rman.h>
 
 MALLOC_DECLARE(M_AGP);
@@ -1439,7 +1438,7 @@ agp_i810_attach(device_t dev)
 	if (error)
 		return (error);
 
-	if (ptoa((vm_paddr_t)Maxmem) >
+	if (ptoa((vm_paddr_t)realmem) >
 	    (1ULL << sc->match->driver->busdma_addr_mask_sz) - 1) {
 		device_printf(dev, "agp_i810 does not support physical "
 		    "memory above %ju.\n", (uintmax_t)(1ULL <<