diff --git a/module/zfs/zap_micro.c b/module/zfs/zap_micro.c
index 1f32e44505..516d46ac7f 100644
--- a/module/zfs/zap_micro.c
+++ b/module/zfs/zap_micro.c
@@ -988,8 +988,10 @@ zap_lookup_impl(zap_t *zap, const char *name,
 			} else {
 				*(uint64_t *)buf =
 				    MZE_PHYS(zap, mze)->mze_value;
-				(void) strlcpy(realname,
-				    MZE_PHYS(zap, mze)->mze_name, rn_len);
+				if (realname != NULL)
+					(void) strlcpy(realname,
+					    MZE_PHYS(zap, mze)->mze_name,
+					    rn_len);
 				if (ncp) {
 					*ncp = mzap_normalization_conflict(zap,
 					    zn, mze);