diff --git a/sys/vm/uma_core.c b/sys/vm/uma_core.c
index a792cf4c3b67..7a535ca6643e 100644
--- a/sys/vm/uma_core.c
+++ b/sys/vm/uma_core.c
@@ -1127,7 +1127,9 @@ keg_small_init(uma_keg_t keg)
 	keg->uk_rsize = rsize;
 	keg->uk_ppera = 1;
 
-	if (keg->uk_flags & UMA_ZONE_REFCNT) {
+	if (keg->uk_flags & UMA_ZONE_OFFPAGE) {
+		shsize = 0;
+	} else if (keg->uk_flags & UMA_ZONE_REFCNT) {
 		rsize += UMA_FRITMREF_SZ;	/* linkage & refcnt */
 		shsize = sizeof(struct uma_slab_refcnt);
 	} else {