diff --git a/src/Input/input.cxx b/src/Input/input.cxx
index 03f90c2f9..999cf1278 100644
--- a/src/Input/input.cxx
+++ b/src/Input/input.cxx
@@ -194,18 +194,6 @@ FGInput::init ()
   glutPassiveMotionFunc (GLUTmotion);
 }
 
-void
-FGInput::bind ()
-{
-  // no op
-}
-
-void
-FGInput::unbind ()
-{
-  // no op
-}
-
 void 
 FGInput::update (double dt)
 {
@@ -214,6 +202,24 @@ FGInput::update (double dt)
   _update_mouse();
 }
 
+void
+FGInput::suspend ()
+{
+    // NO-OP
+}
+
+void
+FGInput::resume ()
+{
+    // NO-OP
+}
+
+bool
+FGInput::is_suspended () const
+{
+    return false;
+}
+
 void
 FGInput::makeDefault (bool status)
 {
diff --git a/src/Input/input.hxx b/src/Input/input.hxx
index 6730a3689..d8a4eae13 100644
--- a/src/Input/input.hxx
+++ b/src/Input/input.hxx
@@ -194,9 +194,10 @@ public:
   // Implementation of FGSubsystem.
   //
   virtual void init ();
-  virtual void bind ();
-  virtual void unbind ();
   virtual void update (double dt);
+  virtual void suspend ();
+  virtual void resume ();
+  virtual bool is_suspended () const;
 
 
   /**