diff --git a/MantidPlot/src/Mantid/MantidUI.cpp b/MantidPlot/src/Mantid/MantidUI.cpp
index 5bfa2c6c7b0524e8c603cf00e9357838b5472e19..40371ce5ed05bedbf9af71313000412e74a0869f 100644
--- a/MantidPlot/src/Mantid/MantidUI.cpp
+++ b/MantidPlot/src/Mantid/MantidUI.cpp
@@ -108,7 +108,6 @@ using MantidQt::MantidWidgets::MantidTreeWidget;
 using Mantid::Kernel::DateAndTime;
 using MantidQt::SliceViewer::SliceViewerWindow;
 
-namespace DropEventHelper = MantidQt::MantidWidgets::DropEventHelper;
 namespace MantidException = Mantid::Kernel::Exception;
 
 namespace {
diff --git a/qt/widgets/common/CMakeLists.txt b/qt/widgets/common/CMakeLists.txt
index 745c29e074ce594a0828338df083b9b178730701..e04bb72b65606baf14e60ea2c83c91f341d1b262 100644
--- a/qt/widgets/common/CMakeLists.txt
+++ b/qt/widgets/common/CMakeLists.txt
@@ -159,7 +159,6 @@ set ( MOC_FILES
   inc/MantidQtWidgets/Common/AlgorithmPropertiesWidget.h
   inc/MantidQtWidgets/Common/BatchAlgorithmRunner.h
   inc/MantidQtWidgets/Common/BoolPropertyWidget.h
-  inc/MantidQtWidgets/Common/DropEventHelper.h
   inc/MantidQtWidgets/Common/FilePropertyWidget.h
   inc/MantidQtWidgets/Common/GenericDialog.h
   inc/MantidQtWidgets/Common/ListPropertyWidget.h