diff --git a/decimal.d.ts b/decimal.d.ts
index 67256b0..0fbc7b2 100644
--- a/decimal.d.ts
+++ b/decimal.d.ts
@@ -56,7 +56,6 @@ export declare class Decimal {
   readonly d: number[];
   readonly e: number;
   readonly s: number;
-  private readonly toStringTag: string;
 
   constructor(n: Decimal.Value);
 
diff --git a/decimal.global.d.ts b/decimal.global.d.ts
index f1683b3..6b28256 100644
--- a/decimal.global.d.ts
+++ b/decimal.global.d.ts
@@ -77,7 +77,6 @@ export declare class Decimal {
   readonly d: number[];
   readonly e: number;
   readonly s: number;
-  private readonly toStringTag: string;
 
   constructor(n: DecimalValue);