1 files changed, 4 insertions, 4 deletions
diff --git a/src/extension/implementation/implementation.cpp b/src/extension/implementation/implementation.cpp
index 6e6100d2b..2a6a76ff4 100644
--- a/src/extension/implementation/implementation.cpp
+++ b/src/extension/implementation/implementation.cpp
@@ -29,24 +29,24 @@ namespace Implementation {
 
 Gtk::Widget *
 Implementation::prefs_input(Inkscape::Extension::Input *module, gchar const */*filename*/) {
-    return module->autogui(NULL, NULL);
+    return module->autogui(nullptr, nullptr);
 }
 
 Gtk::Widget *
 Implementation::prefs_output(Inkscape::Extension::Output *module) {
-    return module->autogui(NULL, NULL);
+    return module->autogui(nullptr, nullptr);
 }
 
 Gtk::Widget *Implementation::prefs_effect(Inkscape::Extension::Effect *module, Inkscape::UI::View::View * view, sigc::signal<void> * changeSignal, ImplementationDocumentCache * /*docCache*/)
 {
     if (module->param_visible_count() == 0) {
-        return NULL;
+        return nullptr;
     }
 
     SPDocument * current_document = view->doc();
 
     auto selected = ((SPDesktop *) view)->getSelection()->items();
-    Inkscape::XML::Node const* first_select = NULL;
+    Inkscape::XML::Node const* first_select = nullptr;
     if (!selected.empty()) {
         const SPItem * item = selected.front();
         first_select = item->getRepr();