diff --git a/src/resources/invoice-resource.ts b/src/resources/invoice-resource.ts
index 8c24b80..8c1c949 100644
--- a/src/resources/invoice-resource.ts
+++ b/src/resources/invoice-resource.ts
@@ -56,7 +56,7 @@ export class InvoiceResource extends ChargebeeResource {
     invoice: { optional: false },
   });
   public readonly pdf = super.request("invoice", "pdf", {
-    invoice: { optional: false },
+    download: { optional: false },
   });
   public readonly downloadEinvoice = super.request(
     "invoice",
diff --git a/src/resources/quote-resource.ts b/src/resources/quote-resource.ts
index 304b321..1d229eb 100644
--- a/src/resources/quote-resource.ts
+++ b/src/resources/quote-resource.ts
@@ -86,6 +86,6 @@ export class QuoteResource extends ChargebeeResource {
     quote: { optional: false },
   });
   public readonly pdf = super.request("quote", "pdf", {
-    quote: { optional: false },
+    download: { optional: false },
   });
 }
diff --git a/src/resources/usage-resource.ts b/src/resources/usage-resource.ts
index 0a71984..593e5b9 100644
--- a/src/resources/usage-resource.ts
+++ b/src/resources/usage-resource.ts
@@ -13,6 +13,6 @@ export class UsageResource extends ChargebeeResource {
     usage: { optional: false },
   });
   public readonly pdf = super.request("usage", "pdf", {
-    usage: { optional: false },
+    download: { optional: false },
   });
 }