diff --git a/ui/qt/models/packet_list_model.cpp b/ui/qt/models/packet_list_model.cpp
index 876ae34b8b..0ed61d745f 100644
--- a/ui/qt/models/packet_list_model.cpp
+++ b/ui/qt/models/packet_list_model.cpp
@@ -180,6 +180,7 @@ void PacketListModel::clear() {
     endResetModel();
     max_row_height_ = 0;
     max_line_count_ = 1;
+    idle_dissection_timer_->invalidate();
     idle_dissection_row_ = 0;
 }