diff --git a/Source/QtDialog/CMakeLists.txt b/Source/QtDialog/CMakeLists.txt
index 29daffde82..1684fb229e 100644
--- a/Source/QtDialog/CMakeLists.txt
+++ b/Source/QtDialog/CMakeLists.txt
@@ -27,6 +27,8 @@ if (Qt5Widgets_FOUND)
   set(QT_LIBRARIES ${Qt5Widgets_LIBRARIES})
   # Remove this when the minimum version of Qt is 4.6.
   add_definitions(-DQT_DISABLE_DEPRECATED_BEFORE=0)
+
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${Qt5Widgets_EXECUTABLE_COMPILE_FLAGS}")
 else()
   set(QT_MIN_VERSION "4.4.0")
   find_package(Qt4 REQUIRED)
diff --git a/Source/QtDialog/QCMakeCacheView.cxx b/Source/QtDialog/QCMakeCacheView.cxx
index 1d21d421d0..031350ba47 100644
--- a/Source/QtDialog/QCMakeCacheView.cxx
+++ b/Source/QtDialog/QCMakeCacheView.cxx
@@ -490,7 +490,11 @@ QCMakePropertyList QCMakeCacheModel::properties() const
       }
 
       // go to the next in the tree
-      while(!idxs.isEmpty() && !idxs.last().sibling(idxs.last().row()+1, 0).isValid())
+      while(!idxs.isEmpty() && (
+#if QT_VERSION < QT_VERSION_CHECK(5, 0, 3)
+        (idxs.last().row()+1) >= rowCount(idxs.last().parent()) ||
+#endif
+        !idxs.last().sibling(idxs.last().row()+1, 0).isValid()))
       {
         idxs.removeLast();
       }