diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
index 5f311b8241f..ad0138a0bb6 100644
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -754,9 +754,15 @@ finished:
 
 		if ((keg->uk_flags & UMA_ZONE_MALLOC) ||
 		    (keg->uk_flags & UMA_ZONE_REFCNT)) {
+			vm_object_t obj;
+
+			if (flags & UMA_SLAB_KMEM)
+				obj = kmem_object;
+			else
+				obj = NULL;
 			for (i = 0; i < keg->uk_ppera; i++)
 				vsetobj((vm_offset_t)mem + (i * PAGE_SIZE),
-				    kmem_object);
+				    obj);
 		}
 		if (keg->uk_flags & UMA_ZONE_OFFPAGE)
 			uma_zfree_internal(keg->uk_slabzone, slab, NULL,
@@ -866,10 +872,17 @@ slab_zalloc(uma_zone_t zone, int wait)
 					    keg->uk_size);
 			}
 			if ((keg->uk_flags & UMA_ZONE_MALLOC) ||
-			    (keg->uk_flags & UMA_ZONE_REFCNT))
+			    (keg->uk_flags & UMA_ZONE_REFCNT)) {
+				vm_object_t obj;
+
+				if (flags & UMA_SLAB_KMEM)
+					obj = kmem_object;
+				else
+					obj = NULL;
 				for (i = 0; i < keg->uk_ppera; i++)
 					vsetobj((vm_offset_t)mem +
-					    (i * PAGE_SIZE), kmem_object);
+					    (i * PAGE_SIZE), obj);
+			}
 			if (keg->uk_flags & UMA_ZONE_OFFPAGE)
 				uma_zfree_internal(keg->uk_slabzone, slab,
 				    NULL, SKIP_NONE);