diff --git a/sys/dev/acpica/acpi_isab.c b/sys/dev/acpica/acpi_isab.c
index 8e305f423b2..144a9e523a9 100644
--- a/sys/dev/acpica/acpi_isab.c
+++ b/sys/dev/acpica/acpi_isab.c
@@ -84,7 +84,7 @@ static driver_t acpi_isab_driver = {
 	sizeof(struct acpi_isab_softc),
 };
 
-DRIVER_MODULE(acpi_isab, acpi, acpi_isab_driver, isab_devclass, 0, 0);
+DRIVER_MODULE(acpi_isab, acpi, acpi_isab_driver, 0, 0);
 MODULE_DEPEND(acpi_isab, acpi, 1, 1, 1);
 
 static int
diff --git a/sys/dev/pci/isa_pci.c b/sys/dev/pci/isa_pci.c
index 3c3b353806c..9f2c33bdfac 100644
--- a/sys/dev/pci/isa_pci.c
+++ b/sys/dev/pci/isa_pci.c
@@ -95,7 +95,7 @@ static driver_t isab_driver = {
     sizeof(struct isab_pci_softc),
 };
 
-DRIVER_MODULE(isab, pci, isab_driver, isab_devclass, 0, 0);
+DRIVER_MODULE(isab, pci, isab_driver, 0, 0);
 
 /*
  * XXX we need to add a quirk list here for bridges that don't correctly
diff --git a/sys/isa/isa_common.c b/sys/isa/isa_common.c
index 3255e76308c..1fd3aa998ee 100644
--- a/sys/isa/isa_common.c
+++ b/sys/isa/isa_common.c
@@ -1113,8 +1113,6 @@ MODULE_VERSION(isa, 1);
  * Code common to ISA bridges.
  */
 
-devclass_t isab_devclass;
-
 int
 isab_attach(device_t dev)
 {
diff --git a/sys/isa/isavar.h b/sys/isa/isavar.h
index c4ac81297e2..b86e64f308d 100644
--- a/sys/isa/isavar.h
+++ b/sys/isa/isavar.h
@@ -165,9 +165,6 @@ ISA_ACCESSOR(pnp_csn, PNP_CSN, int)
 ISA_ACCESSOR(pnp_ldn, PNP_LDN, int)
 ISA_ACCESSOR(pnpbios_handle, PNPBIOS_HANDLE, int)
 
-/* Device class for ISA bridges. */
-extern devclass_t isab_devclass;
-
 extern void	isa_probe_children(device_t dev);
 
 void	isa_dmacascade(int chan);