diff --git a/mongoext/registry.go b/mongoext/registry.go
index 36038d7..f11aa34 100644
--- a/mongoext/registry.go
+++ b/mongoext/registry.go
@@ -11,7 +11,7 @@ func CreateGoExtBsonRegistry() *bsoncodec.Registry {
 	rb := bsoncodec.NewRegistryBuilder()
 
 	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339Time{}), rfctime.RFC3339Time{})
-	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339Time{}), rfctime.RFC3339NanoTime{})
+	rb.RegisterTypeDecoder(reflect.TypeOf(rfctime.RFC3339NanoTime{}), rfctime.RFC3339NanoTime{})
 
 	bsoncodec.DefaultValueEncoders{}.RegisterDefaultEncoders(rb)
 	bsoncodec.DefaultValueDecoders{}.RegisterDefaultDecoders(rb)