diff --git a/common/defs/bitcoin/zcash_testnet.json b/common/defs/bitcoin/zcash_testnet.json
index 065f076b6..06d5e868d 100644
--- a/common/defs/bitcoin/zcash_testnet.json
+++ b/common/defs/bitcoin/zcash_testnet.json
@@ -41,7 +41,8 @@
     "1": 0,
     "2": 0,
     "3": 1537743641,
-    "4": 4122551051
+    "4": 4122551051,
+    "5": 3268858036
   },
   "extra_data": true,
   "timestamp": false,