diff --git a/index.js b/index.js
index 4fc7415..4a57ffc 100644
--- a/index.js
+++ b/index.js
@@ -45,7 +45,7 @@ function hasBinary (obj) {
 
   // see: https://github.com/Automattic/has-binary/pull/4
   if (obj.toJSON && typeof obj.toJSON === 'function') {
-    obj = obj.toJSON();
+    return hasBinary(obj.toJSON());
   }
 
   for (var key in obj) {
diff --git a/test.js b/test.js
index e818ec8..bbe12f1 100644
--- a/test.js
+++ b/test.js
@@ -29,6 +29,11 @@ describe('has-binarydata', function () {
     assert(hasBinary(ob));
   });
 
+  it('should work with an object whose toJSON() returns a buffer', function () {
+    var ob = {a: 'a', b: [], c: 1234, toJSON: function () { return new Buffer('abc'); }};
+    assert(hasBinary(ob));
+  });
+
   it('should work with null', function () {
     assert(!hasBinary(null));
   });