diff --git a/decimal.js b/decimal.js
index e58df57..8f445dd 100644
--- a/decimal.js
+++ b/decimal.js
@@ -4862,7 +4862,7 @@
 
   // Create and configure initial Decimal constructor.
   Decimal = clone(DEFAULTS);
-
+  Decimal.prototype.constructor = Decimal;
   Decimal['default'] = Decimal.Decimal = Decimal;
 
   // Create the internal constants from their string values.
diff --git a/decimal.mjs b/decimal.mjs
index a319764..6ef5d42 100644
--- a/decimal.mjs
+++ b/decimal.mjs
@@ -4861,6 +4861,7 @@ P[Symbol.toStringTag] = 'Decimal';
 
 // Create and configure initial Decimal constructor.
 export var Decimal = clone(DEFAULTS);
+Decimal.prototype.constructor = Decimal;
 
 // Create the internal constants from their string values.
 LN10 = new Decimal(LN10);