diff --git a/lightningd/bitcoind.h b/lightningd/bitcoind.h
index 194739475..cf92e9075 100644
--- a/lightningd/bitcoind.h
+++ b/lightningd/bitcoind.h
@@ -127,8 +127,8 @@ void bitcoind_getchaininfo_(const tal_t *ctx,
 void bitcoind_getrawblockbyheight_(const tal_t *ctx,
 				   struct bitcoind *bitcoind,
 				   u32 height,
-				   void (*cb)(struct bitcoind *bitcoind,
-					      u32 height,
+				   void (*cb)(struct bitcoind *bitcoind_,
+					      u32 height_,
 					      struct bitcoin_blkid *blkid,
 					      struct bitcoin_block *blk,
 					      void *arg),