diff --git a/sys/mips/cavium/octopci_bus_space.c b/sys/mips/cavium/octopci_bus_space.c
index 870fe325f371..05ff904cc392 100644
--- a/sys/mips/cavium/octopci_bus_space.c
+++ b/sys/mips/cavium/octopci_bus_space.c
@@ -230,13 +230,12 @@ octopci_bs_unmap(void *t __unused, bus_space_handle_t bh __unused,
 }
 
 int
-octopci_bs_subregion(void *t __unused, bus_space_handle_t handle __unused,
-	      bus_size_t offset __unused, bus_size_t size __unused,
-	      bus_space_handle_t *nhandle __unused)
+octopci_bs_subregion(void *t __unused, bus_space_handle_t handle,
+	      bus_size_t offset, bus_size_t size __unused,
+	      bus_space_handle_t *bshp)
 {
 
-	printf("SUBREGION?!?!?!\n");
-	/* Do nothing */
+	*bshp = handle + offset;
 	return (0);
 }
 
diff --git a/sys/mips/mips/bus_space_generic.c b/sys/mips/mips/bus_space_generic.c
index e56611ee2e91..84127256389c 100644
--- a/sys/mips/mips/bus_space_generic.c
+++ b/sys/mips/mips/bus_space_generic.c
@@ -245,13 +245,12 @@ generic_bs_unmap(void *t __unused, bus_space_handle_t bh __unused,
 }
 
 int
-generic_bs_subregion(void *t __unused, bus_space_handle_t handle __unused,
-	      bus_size_t offset __unused, bus_size_t size __unused,
-	      bus_space_handle_t *nhandle __unused)
+generic_bs_subregion(void *t __unused, bus_space_handle_t handle,
+	      bus_size_t offset, bus_size_t size __unused,
+	      bus_space_handle_t *bshp)
 {
 
-	printf("SUBREGION?!?!?!\n");
-	/* Do nothing */
+	*bshp = handle + offset;
 	return (0);
 }