diff --git a/src/Linters/HHClientLintError.hack b/src/Linters/HHClientLintError.hack
index 27bb739ed..4cbfe135f 100644
--- a/src/Linters/HHClientLintError.hack
+++ b/src/Linters/HHClientLintError.hack
@@ -26,6 +26,7 @@ final class HHClientLintError implements LintError {
     'bypass_changed_lines' => bool,
     'original' => string,
     'replacement' => string,
+    ...
   );
 
   public function __construct(
diff --git a/src/Linters/HHClientLinter.hack b/src/Linters/HHClientLinter.hack
index 4fe097b7a..71023d551 100644
--- a/src/Linters/HHClientLinter.hack
+++ b/src/Linters/HHClientLinter.hack
@@ -63,6 +63,7 @@ final class HHClientLinter implements Linter {
   const type TJSONResult = shape(
     'errors' => vec<HHClientLintError::TJSONError>,
     'version' => string,
+    ...
   );
 
   private static function blameCode(