diff --git a/src/library/tactic/exact_tactic.cpp b/src/library/tactic/exact_tactic.cpp
index 9767d827e..0760b526a 100644
--- a/src/library/tactic/exact_tactic.cpp
+++ b/src/library/tactic/exact_tactic.cpp
@@ -20,7 +20,7 @@ tactic exact_tactic(elaborate_fn const & elab, expr const & e) {
                 return none_proof_state();
             }
             expr t            = head(gs).get_type();
-            bool report_unassigned = true;
+            bool report_unassigned = false;
             if (auto new_e = elaborate_with_respect_to(env, ios, elab, new_s, e, some_expr(t), report_unassigned)) {
                 goals const & gs   = new_s.get_goals();
                 goal const & g     = head(gs);