diff --git a/tests/proofmode_ascii.v b/tests/proofmode_ascii.v
index e29a22860f68e44a162e35c12d4a5cb4cc78ab32..cab53ecec4176b001d1e7a9e27df9ca99f6f4add 100644
--- a/tests/proofmode_ascii.v
+++ b/tests/proofmode_ascii.v
@@ -6,6 +6,10 @@ From iris.bi Require Import ascii.
 
 Set Default Proof Using "Type".
 
+(* Remove this and the [Set Printing Raw Literals.] below once we require Coq
+8.14. *)
+Set Warnings "-unknown-option".
+
 Section base_logic_tests.
   Context {M : ucmra}.
   Implicit Types P Q R : uPred M.