diff --git a/src/analyze/gui/topproxy.cpp b/src/analyze/gui/topproxy.cpp
index fa98e43..f0dceb0 100644
--- a/src/analyze/gui/topproxy.cpp
+++ b/src/analyze/gui/topproxy.cpp
@@ -1,85 +1,87 @@
 /*
  * Copyright 2016-2017 Milian Wolff <mail@milianw.de>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
  * License along with this library; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
 #include "topproxy.h"
 
 #include <KLocalizedString>
 
 namespace {
 TreeModel::Columns toSource(TopProxy::Type type)
 {
     switch (type) {
     case TopProxy::Peak:
         return TreeModel::PeakColumn;
     case TopProxy::Leaked:
         return TreeModel::LeakedColumn;
     case TopProxy::Allocations:
         return TreeModel::AllocationsColumn;
     case TopProxy::Temporary:
         return TreeModel::TemporaryColumn;
     case TopProxy::Allocated:
         return TreeModel::AllocatedColumn;
     }
     Q_UNREACHABLE();
 }
 }
 
 TopProxy::TopProxy(Type type, QObject* parent)
     : QSortFilterProxyModel(parent)
     , m_type(type)
 {
 }
 
 TopProxy::~TopProxy() = default;
 
 bool TopProxy::filterAcceptsColumn(int source_column, const QModelIndex& /*source_parent*/) const
 {
     return source_column == TreeModel::LocationColumn || source_column == toSource(m_type);
 }
 
 bool TopProxy::filterAcceptsRow(int source_row, const QModelIndex& source_parent) const
 {
     if (source_parent.isValid()) {
         // only show top rows
         return false;
     }
     const auto index = sourceModel()->index(source_row, toSource(m_type));
     const auto cost = index.data(TreeModel::SortRole).toLongLong();
-    if (cost < m_costThreshold) {
+    // note: explicitly exclude zero values, which could show up when we diff files
+    //       and no change was observed (overall) for a given metric
+    if (!cost || cost < m_costThreshold) {
         // don't show rows that didn't leak anything, or didn't trigger any
         // temporary allocations
         // in general, hide anything that's not really interesting
         return false;
     }
     return true;
 }
 
 void TopProxy::setSourceModel(QAbstractItemModel* sourceModel)
 {
     QSortFilterProxyModel::setSourceModel(sourceModel);
     connect(sourceModel, &QAbstractItemModel::modelReset,
             this, &TopProxy::updateCostThreshold, Qt::UniqueConnection);
     updateCostThreshold();
 }
 
 void TopProxy::updateCostThreshold()
 {
     // hide anything below 1% of the max cost
     m_costThreshold = sourceModel()->index(0, toSource(m_type)).data(TreeModel::MaxCostRole).toLongLong() * 0.01;
     invalidate();
 }