diff --git a/dist/lib/swagger-client.js b/dist/lib/swagger-client.js
index 7f7320a5..05a89263 100644
--- a/dist/lib/swagger-client.js
+++ b/dist/lib/swagger-client.js
@@ -2173,8 +2173,8 @@ Operation.prototype.execute = function(arg1, arg2, arg3, arg4, parent) {
     fail(message);
     return;
   }
-
   var headers = this.getHeaderParams(args);
+  headers = this.setContentTypes(args, opts);
   var body = this.getBody(headers, args);
   var url = this.urlify(args);
 
diff --git a/lib/swagger-client.js b/lib/swagger-client.js
index 7f7320a5..05a89263 100644
--- a/lib/swagger-client.js
+++ b/lib/swagger-client.js
@@ -2173,8 +2173,8 @@ Operation.prototype.execute = function(arg1, arg2, arg3, arg4, parent) {
     fail(message);
     return;
   }
-
   var headers = this.getHeaderParams(args);
+  headers = this.setContentTypes(args, opts);
   var body = this.getBody(headers, args);
   var url = this.urlify(args);