diff --git a/tests/lean/run/class_coe.lean b/tests/lean/run/class_coe.lean
index 0fd7b20589..7feae75afa 100644
--- a/tests/lean/run/class_coe.lean
+++ b/tests/lean/run/class_coe.lean
@@ -46,8 +46,10 @@ check 0 + i
 check i + 0
 check 0 + x
 check x + 0
+namespace foo
 variable eq {A : Type} : A → A → Prop
 infixl `=`:50 := eq
 abbreviation id (A : Type) (a : A) := a
 notation A `=` B `:` C := @eq C A B
 check nat_to_int n + nat_to_int m = (n + m) : int
+end foo