diff --git a/src/core/io/decoder.ts b/src/core/io/decoder.ts
index 2447d53..eea67cf 100644
--- a/src/core/io/decoder.ts
+++ b/src/core/io/decoder.ts
@@ -871,7 +871,7 @@ export class Decoder {
     contract.right = validateOptionType(this.readStr() as OptionType);
 
     if (version >= 7) {
-      contract.multiplier = this.readInt();
+      contract.multiplier = this.readDouble();
       contract.primaryExch = this.readStr();
     }
 
@@ -979,7 +979,7 @@ export class Decoder {
     ) {
       this.readInt(); // mdSizeMultiplier - not used anymore
     }
-    contract.contract.multiplier = this.readInt();
+    contract.contract.multiplier = this.readDouble();
     contract.orderTypes = this.readStr();
     contract.validExchanges = this.readStr();
 
@@ -1132,7 +1132,7 @@ export class Decoder {
     contract.right = validateOptionType(this.readStr() as OptionType);
 
     if (version >= 9) {
-      contract.multiplier = this.readInt();
+      contract.multiplier = this.readDouble();
     }
 
     contract.exchange = this.readStr();
@@ -1894,7 +1894,7 @@ export class Decoder {
     contract.lastTradeDateOrContractMonth = this.readStr();
     contract.strike = this.readDouble();
     contract.right = validateOptionType(this.readStr() as OptionType);
-    contract.multiplier = this.readInt();
+    contract.multiplier = this.readDouble();
     contract.exchange = this.readStr();
     contract.currency = this.readStr();
     contract.localSymbol = this.readStr();
@@ -1982,7 +1982,7 @@ export class Decoder {
     contract.lastTradeDateOrContractMonth = this.readStr();
     contract.strike = this.readDouble();
     contract.right = validateOptionType(this.readStr() as OptionType);
-    contract.multiplier = this.readInt();
+    contract.multiplier = this.readDouble();
     contract.exchange = this.readStr();
     contract.currency = this.readStr();
     contract.localSymbol = this.readStr();
@@ -2053,7 +2053,7 @@ export class Decoder {
     const exchange = this.readStr();
     const underlyingConId = this.readInt();
     const tradingClass = this.readStr();
-    const multiplier = this.readStr();
+    const multiplier = this.readDouble();
     const expCount = this.readInt();
     const expirations: unknown[] = [];