diff --git a/tests/algebra.v b/tests/algebra.v
index 028272cea5e582c85243c312e6582241c13e5648..5dd2e68aa47501844664db73a4af79c35472f566 100644
--- a/tests/algebra.v
+++ b/tests/algebra.v
@@ -1,5 +1,7 @@
 From iris.base_logic.lib Require Import invariants.
 
+Instance test_cofe: Cofe (iPreProp Σ) := _.
+
 Section tests.
   Context `{!invG Σ}.