diff --git a/internal/consensus/state.go b/internal/consensus/state.go
index 3d8ecfdef..af12948e1 100644
--- a/internal/consensus/state.go
+++ b/internal/consensus/state.go
@@ -1791,7 +1791,12 @@ func (cs *State) enterPrecommitWait(ctx context.Context, height int64, round int
 
 	defer func() {
 		// Done enterPrecommitWait:
-		cs.TriggeredTimeoutPrecommit = true
+		func() {
+			cs.mtx.Lock()
+			defer cs.mtx.Unlock()
+
+			cs.TriggeredTimeoutPrecommit = true
+		}()
 		cs.newStep(ctx)
 	}()