diff --git a/iris/base_logic/lib/cancelable_invariants.v b/iris/base_logic/lib/cancelable_invariants.v
index 8273c0797a3940270cf051043ae2a403deb5768a..5eba9f038fa85248333233cf78eef5d888ed7a14 100644
--- a/iris/base_logic/lib/cancelable_invariants.v
+++ b/iris/base_logic/lib/cancelable_invariants.v
@@ -5,7 +5,7 @@ From iris.base_logic.lib Require Export invariants.
 From iris.prelude Require Import options.
 Import uPred.
 
-Class cinvG Σ := cinv_inG : inG Σ fracR.
+Class cinvG Σ := { cinv_inG : inG Σ fracR }.
 Local Existing Instance cinv_inG.
 
 Definition cinvΣ : gFunctors := #[GFunctor fracR].