diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index d7548fb1e70134a6b6a058a1f66cca3c0372a42c..8e9cb4d600d8a7c7060c89c4377112e5604d8f9e 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -31,6 +31,7 @@ build-coq.dev:
   <<: *template
   variables:
     OPAM_PINS: "coq version dev"
+    MANGLE_NAMES: "1"
     CI_COQCHK: "1"
 
 build-coq.8.12.0:
diff --git a/tests/telescopes.v b/tests/telescopes.v
index 207457b880937b2a7c500e4ff3786c660e1e4119..ede324c066e674a4f04c01e4e686deb49f73d954 100644
--- a/tests/telescopes.v
+++ b/tests/telescopes.v
@@ -1,5 +1,7 @@
 From stdpp Require Import tactics telescopes.
 
+Local Unset Mangle Names. (* for stable goal printing *)
+
 Section accessor.
 (* This is like Iris' accessors, but in Prop.  Just to play with telescopes. *)
 Definition accessor {X : tele} (α β γ : X → Prop) : Prop :=