diff --git a/util.c b/util.c
index f8c8192..374afca 100644
--- a/util.c
+++ b/util.c
@@ -1012,6 +1012,36 @@ out:
 	return ret;
 }
 
+/**
+ * Extract bloc height     L H... here len=3, height=0x1333e8
+ * "...0000000000ffffffff2703e83313062f503253482f043d61105408"
+ */
+static uint32_t getblocheight(struct stratum_ctx *sctx)
+{
+	uint32_t height = 0;
+	uint8_t hlen = 0, *p, *m;
+
+	// find 0xffff tag
+	p = (uint8_t*) sctx->job.coinbase + 32;
+	m = p + 128;
+	while (*p != 0xff && p < m) p++;
+	while (*p == 0xff && p < m) p++;
+	if (*(p-1) == 0xff && *(p-2) == 0xff) {
+		p++; hlen = *p;
+		p++; height = le16dec(p);
+		p += 2;
+		switch (hlen) {
+			case 4:
+				height += 0x10000UL * le16dec(p);
+				break;
+			case 3:
+				height += 0x10000UL * (*p);
+				break;
+		}
+	}
+	return height;
+}
+
 static bool stratum_notify(struct stratum_ctx *sctx, json_t *params)
 {
 	const char *job_id, *prevhash, *coinb1, *coinb2, *version, *nbits, *stime, *nreward;
@@ -1020,7 +1050,7 @@ static bool stratum_notify(struct stratum_ctx *sctx, json_t *params)
 	int merkle_count, i;
 	json_t *merkle_arr;
 	unsigned char **merkle;
-	int ntime, hoffset;
+	int ntime;
 
 	job_id = json_string_value(json_array_get(params, 0));
 	prevhash = json_string_value(json_array_get(params, 1));
@@ -1078,8 +1108,6 @@ static bool stratum_notify(struct stratum_ctx *sctx, json_t *params)
 	hex2bin(sctx->job.coinbase, coinb1, coinb1_size);
 	memcpy(sctx->job.coinbase + coinb1_size, sctx->xnonce1, sctx->xnonce1_size);
 
-	hoffset = coinb1_size - 15; // 43;
-	sctx->bloc_height = le16dec((uint8_t*) sctx->job.coinbase + hoffset);
 	if (!sctx->job.job_id || strcmp(sctx->job.job_id, job_id))
 		memset(sctx->job.xnonce2, 0, sctx->xnonce2_size);
 	hex2bin(sctx->job.xnonce2 + sctx->xnonce2_size, coinb2, coinb2_size);
@@ -1088,6 +1116,8 @@ static bool stratum_notify(struct stratum_ctx *sctx, json_t *params)
 	sctx->job.job_id = strdup(job_id);
 	hex2bin(sctx->job.prevhash, prevhash, 32);
 
+	sctx->bloc_height = getblocheight(sctx);
+
 	for (i = 0; i < sctx->job.merkle_count; i++)
 		free(sctx->job.merkle[i]);
 	free(sctx->job.merkle);