diff --git a/amqplib/amqplib-tests.ts b/amqplib/amqplib-tests.ts
index 134306e51e..9a15e250f4 100644
--- a/amqplib/amqplib-tests.ts
+++ b/amqplib/amqplib-tests.ts
@@ -24,6 +24,7 @@ amqp.connect("amqp://localhost")
 
 // test promise api properties
 var amqpMessage: amqp.Message;
+amqpMessage.properties.contentType === "application/json";
 var amqpAssertExchangeOptions: amqp.Options.AssertExchange;
 var anqpAssertExchangeReplies: amqp.Replies.AssertExchange;
 
@@ -61,5 +62,6 @@ amqpcb.connect("amqp://localhost", (err, connection) => {
 
 // test callback api properties
 var amqpcbMessage: amqp.Message;
+amqpMessage.properties.contentType === "application/json";
 var amqpcbAssertExchangeOptions: amqp.Options.AssertExchange;
 var anqpcbAssertExchangeReplies: amqp.Replies.AssertExchange;
\ No newline at end of file
diff --git a/amqplib/amqplib.d.ts b/amqplib/amqplib.d.ts
index 0c76495efc..d03c46ed79 100644
--- a/amqplib/amqplib.d.ts
+++ b/amqplib/amqplib.d.ts
@@ -66,7 +66,7 @@ declare module "amqplib/properties" {
 
             contentType?: string;
             contentEncoding?: string;
-            headers?: Object;
+            headers?: any;
             priority?: number;
             correlationId?: string;
             replyTo?: string;
@@ -81,7 +81,7 @@ declare module "amqplib/properties" {
             noAck?: boolean;
             exclusive?: boolean;
             priority?: number;
-            arguments?: Object;
+            arguments?: any;
         }
         interface Get {
             noAck?: boolean;
@@ -90,8 +90,8 @@ declare module "amqplib/properties" {
 
     interface Message {
         content: Buffer;
-        fields: Object;
-        properties: Object;
+        fields: any;
+        properties: any;
     }
 }