diff --git a/src/base/BaseTwilio.ts b/src/base/BaseTwilio.ts
index d6a4ee757..f6651c8a7 100644
--- a/src/base/BaseTwilio.ts
+++ b/src/base/BaseTwilio.ts
@@ -170,7 +170,10 @@ namespace Twilio {
       });
       headers["Accept-Charset"] = "utf-8";
 
-      if (opts.method === "post" && !headers["Content-Type"]) {
+      if (
+        (opts.method === "post" || opts.method === "put") &&
+        !headers["Content-Type"]
+      ) {
         headers["Content-Type"] = "application/x-www-form-urlencoded";
       }