diff --git a/avogadro/qtplugins/forcefield/forcefield.cpp b/avogadro/qtplugins/forcefield/forcefield.cpp
index 70bf78172f..49dadc94e9 100644
--- a/avogadro/qtplugins/forcefield/forcefield.cpp
+++ b/avogadro/qtplugins/forcefield/forcefield.cpp
@@ -117,19 +117,7 @@ Forcefield::Forcefield(QObject* parent_)
   connect(action, SIGNAL(triggered()), SLOT(unfreezeSelected()));
   m_actions.push_back(action);
 
-  // single-shot timer to allow the GUI to start up
-  QTimer::singleShot(500, this, SLOT(deferredStart()));
-}
-
-Forcefield::~Forcefield() {}
-
-QList<QAction*> Forcefield::actions() const
-{
-  return m_actions;
-}
-
-void Forcefield::deferredStart()
-{
+  // initialize the calculators
 
   // prefer to use Python interface scripts if available
   refreshScripts();
@@ -150,6 +138,13 @@ void Forcefield::deferredStart()
 #endif
 }
 
+Forcefield::~Forcefield() {}
+
+QList<QAction*> Forcefield::actions() const
+{
+  return m_actions;
+}
+
 QStringList Forcefield::menuPath(QAction* action) const
 {
   QStringList path;
diff --git a/avogadro/qtplugins/forcefield/forcefield.h b/avogadro/qtplugins/forcefield/forcefield.h
index 7b8bcc98f9..a08e75675c 100644
--- a/avogadro/qtplugins/forcefield/forcefield.h
+++ b/avogadro/qtplugins/forcefield/forcefield.h
@@ -76,8 +76,6 @@ private slots:
   void freezeSelected();
   void unfreezeSelected();
 
-  void deferredStart();
-
 private:
   QList<QAction*> m_actions;
   QtGui::Molecule* m_molecule = nullptr;
diff --git a/avogadro/vtk/CMakeLists.txt b/avogadro/vtk/CMakeLists.txt
index 549626e42f..6cfc703d92 100644
--- a/avogadro/vtk/CMakeLists.txt
+++ b/avogadro/vtk/CMakeLists.txt
@@ -1,3 +1,4 @@
+find_package(OpenGL REQUIRED)
 find_package(GLEW REQUIRED)
 
 if(WIN32 AND NOT BUILD_SHARED_LIBS)