diff --git a/module/zfs/include/sys/dmu.h b/module/zfs/include/sys/dmu.h
index d4dc194611..b48b4f416b 100644
--- a/module/zfs/include/sys/dmu.h
+++ b/module/zfs/include/sys/dmu.h
@@ -483,6 +483,8 @@ int dmu_free_object(objset_t *os, uint64_t object);
 #define	DMU_WRITE_ZEROCOPY	4 /* zerocopy on write (test) */
 int dmu_read(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	void *buf, uint32_t flags);
+void dmu_write_impl(objset_t *os, uint64_t object, uint64_t offset,
+	uint64_t size, const void *buf, dmu_tx_t *tx, int flags);
 void dmu_write(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
 	const void *buf, dmu_tx_t *tx);
 void dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,