diff --git a/TypeScript/snowflakeIdv1.ts b/TypeScript/snowflakeIdv1.ts
index b04e74a..ef1383c 100644
--- a/TypeScript/snowflakeIdv1.ts
+++ b/TypeScript/snowflakeIdv1.ts
@@ -115,7 +115,7 @@ export class snowflakeIdv1 {
 
         // 5.MaxSeqNumber
         if (options.maxSeqNumber == undefined || options.maxSeqNumber <= 0)
-            options.maxSeqNumber = (1 << options.SeqBitLength) - 1
+            options.maxSeqNumber = (1 << options.seqBitLength) - 1
 
         // 6.MinSeqNumber
         const MinSeqNumber = 5