diff --git a/sys/sparc64/pci/psycho.c b/sys/sparc64/pci/psycho.c
index 7f6fdc26335..f916be08720 100644
--- a/sys/sparc64/pci/psycho.c
+++ b/sys/sparc64/pci/psycho.c
@@ -159,7 +159,8 @@ static devclass_t psycho_devclass;
 
 DEFINE_CLASS_0(pcib, psycho_driver, psycho_methods,
     sizeof(struct psycho_softc));
-DRIVER_MODULE(psycho, nexus, psycho_driver, psycho_devclass, 0, 0);
+EARLY_DRIVER_MODULE(psycho, nexus, psycho_driver, psycho_devclass, 0, 0,
+    BUS_PASS_BUS);
 
 static SLIST_HEAD(, psycho_softc) psycho_softcs =
     SLIST_HEAD_INITIALIZER(psycho_softcs);
diff --git a/sys/sparc64/pci/schizo.c b/sys/sparc64/pci/schizo.c
index f34666789d3..d2e22bc65f3 100644
--- a/sys/sparc64/pci/schizo.c
+++ b/sys/sparc64/pci/schizo.c
@@ -158,7 +158,8 @@ static devclass_t schizo_devclass;
 
 DEFINE_CLASS_0(pcib, schizo_driver, schizo_methods,
     sizeof(struct schizo_softc));
-DRIVER_MODULE(schizo, nexus, schizo_driver, schizo_devclass, 0, 0);
+EARLY_DRIVER_MODULE(schizo, nexus, schizo_driver, schizo_devclass, 0, 0,
+    BUS_PASS_BUS);
 
 static SLIST_HEAD(, schizo_softc) schizo_softcs =
     SLIST_HEAD_INITIALIZER(schizo_softcs);