diff --git a/src/generator.c b/src/generator.c
index fccc5f0d..5f193306 100644
--- a/src/generator.c
+++ b/src/generator.c
@@ -327,7 +327,7 @@ bool generator_submitblock(ckpool_t *ckp, char *buf)
 	}
 	cs = &si->cs;
 	LOGNOTICE("Submitting block data!");
-	return submit_block(cs, buf + 64 + 1);
+	return submit_block(cs, buf);
 }
 
 bool generator_get_blockhash(ckpool_t *ckp, int height, char *hash)
diff --git a/src/stratifier.c b/src/stratifier.c
index 3777dfcc..18c8c23c 100644
--- a/src/stratifier.c
+++ b/src/stratifier.c
@@ -2054,13 +2054,12 @@ process_block(ckpool_t *ckp, const workbase_t *wb, const char *coinbase, const i
 	char hexcoinbase[1024];
 	bool ret;
 
-	gbt_block = ckalloc(1024);
 	flip_32(flip32, hash);
 	__bin2hex(blockhash, flip32, 32);
 
-	/* Message format: "hash,data" */
-	sprintf(gbt_block, "%s,", blockhash);
-	__bin2hex(gbt_block + 64 + 1, data, 80);
+	/* Message format: "data" */
+	gbt_block = ckzalloc(1024);
+	__bin2hex(gbt_block, data, 80);
 	if (txns < 0xfd) {
 		uint8_t val8 = txns;