diff --git a/src/Codegen/Generator.hack b/src/Codegen/Generator.hack
index f68c762..ae2bde3 100644
--- a/src/Codegen/Generator.hack
+++ b/src/Codegen/Generator.hack
@@ -242,7 +242,11 @@ final class Generator {
         }
 
         foreach ($classish_objects as $class) {
-            if (\is_subclass_of($class->getName(), \Slack\GraphQL\Pagination\Connection::class)) {
+            $rc = new \ReflectionClass($class->getName());
+            if (
+                \is_subclass_of($class->getName(), \Slack\GraphQL\Pagination\Connection::class) &&
+                $rc->getAttributeClass(\Slack\GraphQL\ObjectType::class)
+            ) {
                 invariant(
                     Str\ends_with($class->getName(), 'Connection'),
                     "All connection types must have names ending with `Connection`. `%s` does not.",
diff --git a/src/Pagination/Connection.hack b/src/Pagination/Connection.hack
index 1328d09..2567a04 100644
--- a/src/Pagination/Connection.hack
+++ b/src/Pagination/Connection.hack
@@ -57,6 +57,7 @@ abstract class Connection {
      *
      * This should be the Hack class over which you want to paginate.
      */
+     <<__Enforceable>>
     abstract const type TNode;
 
     /**