diff --git a/src/IECoreVDB/VDBObject.cpp b/src/IECoreVDB/VDBObject.cpp
index c96cfea9c2..8a3d8244e0 100644
--- a/src/IECoreVDB/VDBObject.cpp
+++ b/src/IECoreVDB/VDBObject.cpp
@@ -286,7 +286,7 @@ IECore::CompoundObjectPtr VDBObject::metadata( const std::string &name )
 
 bool VDBObject::isEqualTo( const IECore::Object *other ) const
 {
-	if( !IECoreScene::VisibleRenderable::isNotEqualTo( other ) )
+	if( !IECoreScene::VisibleRenderable::isEqualTo( other ) )
 	{
 		return false;
 	}
diff --git a/test/IECoreVDB/VDBObjectTest.py b/test/IECoreVDB/VDBObjectTest.py
index 7b15fede6e..a43aa316c4 100644
--- a/test/IECoreVDB/VDBObjectTest.py
+++ b/test/IECoreVDB/VDBObjectTest.py
@@ -260,6 +260,16 @@ def testFilename( self ) :
 		emptyVDB = IECoreVDB.VDBObject()
 		self.assertEqual( emptyVDB.fileName(), "" )
 
+	def testEquality( self ) :
+
+		o = IECoreVDB.VDBObject( os.path.join( self.dataDir, "smoke.vdb" ) )
+		self.assertEqual( o, o )
+
+		o2 = o.copy()
+		o2.findGrid( "density" ).mapAll( lambda value : value + 1 )
+
+		self.assertNotEqual( o2, o )
+		self.assertEqual( o2, o2 )
 
 if __name__ == "__main__":
 	unittest.main()