diff --git a/sys/i386/isa/isa_compat.c b/sys/i386/isa/isa_compat.c
index 43a7ae2a1582..8834931400fb 100644
--- a/sys/i386/isa/isa_compat.c
+++ b/sys/i386/isa/isa_compat.c
@@ -39,6 +39,7 @@
 #include <vm/vm.h>
 #include <vm/pmap.h>
 #include <machine/pmap.h>
+#include <machine/md_var.h>
 
 #include <machine/resource.h>
 #include <isa/isavar.h>
@@ -169,21 +170,21 @@ isa_compat_probe(device_t dev)
 		dvp->id_maddr = maddr;
 		portsize = dvp->id_driver->probe(dvp);
 		isa_compat_release_resources(dev, &res);
-		/* isa_release_resource clobbers the hints - reset them! */
-		if (dvp->id_iobase > 0)
-			isa_set_port(dev, dvp->id_iobase);
-		if (portsize > 0)
-			isa_set_portsize(dev, portsize);
-		if (dvp->id_irq != 0)
-			isa_set_irq(dev, ffs(dvp->id_irq) - 1);
-		if (dvp->id_drq != -1)
-			isa_set_drq(dev, dvp->id_drq);
-		if (dvp->id_maddr != 0)
-			isa_set_maddr(dev, (int)kvtop(dvp->id_maddr)); /* XXX */
-		if (dvp->id_msize != 0)
-			isa_set_msize(dev, dvp->id_msize);
-		if (portsize != 0)
+		if (portsize != 0) {
+			if (portsize > 0)
+				isa_set_portsize(dev, portsize);
+			if (dvp->id_iobase != isa_get_port(dev))
+				isa_set_port(dev, dvp->id_iobase);
+			if (dvp->id_irq != irqmask(isa_get_irq(dev)))
+				isa_set_irq(dev, ffs(dvp->id_irq) - 1);
+			if (dvp->id_drq != isa_get_drq(dev))
+				isa_set_drq(dev, dvp->id_drq);
+			if (dvp->id_maddr != maddr)
+				isa_set_maddr(dev, (int)kvtop(dvp->id_maddr));
+			if (dvp->id_msize != isa_get_msize(dev))
+				isa_set_msize(dev, dvp->id_msize);
 			return 0;
+		}
 	}
 	return ENXIO;
 }