diff --git a/src/frontends/lean/tactic_hint.h b/src/frontends/lean/tactic_hint.h
index 314832bab..b8e5d76a1 100644
--- a/src/frontends/lean/tactic_hint.h
+++ b/src/frontends/lean/tactic_hint.h
@@ -10,7 +10,7 @@ Author: Leonardo de Moura
 
 namespace lean {
 class tactic_hint_entry {
-    friend class tactic_hint_config;
+    friend struct tactic_hint_config;
     name   m_class;
     expr   m_pre_tactic;
     tactic m_tactic;