diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c
index 1f6fa93406c9..ea0d6abf5dea 100644
--- a/module/zfs/dbuf.c
+++ b/module/zfs/dbuf.c
@@ -1115,6 +1115,10 @@ dbuf_dirty(dmu_buf_impl_t *db, dmu_tx_t *tx)
 		DB_DNODE_EXIT(db);
 
 		if (db->db_level == 0 && db->db_blkid != DMU_BONUS_BLKID) {
+			/* Wait for pending I/O. */
+			while (dr->dt.dl.dr_override_state == DR_IN_DMU_SYNC)
+				cv_wait(&db->db_changed, &db->db_mtx);
+
 			/*
 			 * If this buffer has already been written out,
 			 * we now need to reset its state.