diff --git a/lib/model-helper.js b/lib/model-helper.js
index 51fbf53..598f0f1 100644
--- a/lib/model-helper.js
+++ b/lib/model-helper.js
@@ -121,9 +121,12 @@ var modelHelper = module.exports = {
     if (typeof propType === 'function') {
       // See https://github.com/strongloop/loopback-explorer/issues/32
       // The type can be a model class
-      propType = propType.modelName || propType.name.toLowerCase();
-    } else if(Array.isArray(propType)) {
-      propType = 'array';
+      return propType.modelName || propType.name.toLowerCase();
+    } else if (Array.isArray(propType)) {
+      return 'array';
+    } else if (typeof propType === 'object') {
+      // Anonymous objects, they are allowed e.g. in accepts/returns definitions
+      return 'object';
     }
     return propType;
   },
diff --git a/test/model-helper.test.js b/test/model-helper.test.js
index b183400..1fb6414 100644
--- a/test/model-helper.test.js
+++ b/test/model-helper.test.js
@@ -214,6 +214,13 @@ describe('model-helper', function() {
       expect(def.properties).to.have.property('visibleProperty');
     });
   });
+
+  describe('getPropType', function() {
+    it('converts anonymous object types', function() {
+      var type = modelHelper.getPropType({ name: 'string', value: 'string' });
+      expect(type).to.eql('object');
+    });
+  });
 });
 
 // Simulates the format of a remoting class.