diff --git a/templates/javascript/api-single.mustache b/templates/javascript/api-single.mustache
index c7588ccfb6..c2f3e6f2c1 100644
--- a/templates/javascript/api-single.mustache
+++ b/templates/javascript/api-single.mustache
@@ -91,7 +91,7 @@ export function create{{capitalizedApiName}}(options: CreateClientOptions{{#hasR
     requestsCache: options.requestsCache,
     responsesCache: options.responsesCache,
     baseHeaders: {
-      'content-type': 'application/x-www-form-urlencoded',
+      'content-type': 'text/plain',
       ...auth.headers(),
     },
     baseQueryParameters: auth.queryParameters(),