diff --git a/fabric-client/types/index.d.ts b/fabric-client/types/index.d.ts
index 8e8407e03b..7707ef0f23 100644
--- a/fabric-client/types/index.d.ts
+++ b/fabric-client/types/index.d.ts
@@ -343,7 +343,7 @@ declare namespace Client {
   }
 
   export interface ChaincodeInstantiateUpgradeRequest {
-    targets?: Peer[];
+    targets?: Peer[] | string[];
     chaincodeType?: ChaincodeType;
     chaincodeId: string;
     chaincodeVersion: string;
@@ -355,7 +355,7 @@ declare namespace Client {
   }
 
   export interface ChaincodeInvokeRequest {
-    targets?: Peer[];
+    targets?: Peer[] | string[];
     chaincodeId: string;
     txId: TransactionId;
     transientMap?: any;
@@ -366,7 +366,7 @@ declare namespace Client {
   }
 
   export interface ChaincodeQueryRequest {
-    targets?: Peer[];
+    targets?: Peer[] | string[];
     chaincodeId: string;
     transientMap?: any;
     fcn?: string;