diff --git a/tests/lean/slow/nat_bug2.lean b/tests/lean/slow/nat_bug2.lean
index dee720fc5..2aa0534a5 100644
--- a/tests/lean/slow/nat_bug2.lean
+++ b/tests/lean/slow/nat_bug2.lean
@@ -4,7 +4,7 @@
 -- Author: Floris van Doorn
 ----------------------------------------------------------------------------------------------------
 import logic algebra.binary
-open tactic binary eq.ops eq
+open binary eq.ops eq
 open decidable
 namespace experiment
 definition refl := @eq.refl
@@ -27,7 +27,7 @@ definition to_nat [coercion] (n : num) : ℕ
 := num.rec zero (λ n, pos_num.rec (succ zero) (λ n r, plus r (plus r (succ zero))) (λ n r, plus r r) n) n
 
 namespace helper_tactics
-  definition apply_refl := apply @refl
+  definition apply_refl := tactic.apply @refl
   tactic_hint apply_refl
 end helper_tactics
 open helper_tactics
diff --git a/tests/lean/slow/nat_wo_hints.lean b/tests/lean/slow/nat_wo_hints.lean
index 1ea1782e6..af66f4c9c 100644
--- a/tests/lean/slow/nat_wo_hints.lean
+++ b/tests/lean/slow/nat_wo_hints.lean
@@ -4,7 +4,7 @@
 -- Author: Floris van Doorn
 ----------------------------------------------------------------------------------------------------
 import logic algebra.binary
-open tactic binary eq.ops eq
+open binary eq.ops eq
 open decidable
 
 namespace experiment
@@ -23,7 +23,7 @@ definition to_nat [coercion] (n : num) : ℕ
 := num.rec zero (λ n, pos_num.rec (succ zero) (λ n r, plus r (plus r (succ zero))) (λ n r, plus r r) n) n
 
 namespace helper_tactics
-  definition apply_refl := apply @eq.refl
+  definition apply_refl := tactic.apply @eq.refl
   tactic_hint apply_refl
 end helper_tactics
 open helper_tactics