diff --git a/src/Input/input.cxx b/src/Input/input.cxx
index 09ef2c21d..2547e523d 100644
--- a/src/Input/input.cxx
+++ b/src/Input/input.cxx
@@ -114,6 +114,12 @@ getModSuper ()
   return bool(fgGetKeyModifiers() & KEYMOD_SUPER);
 }
 
+static bool
+getModHyper ()
+{
+  return bool(fgGetKeyModifiers() & KEYMOD_HYPER);
+}
+
 
 ////////////////////////////////////////////////////////////////////////
 // Implementation of FGInput.
@@ -165,6 +171,7 @@ FGInput::bind ()
   fgTie("/devices/status/keyboard/alt", getModAlt);
   fgTie("/devices/status/keyboard/meta", getModMeta);
   fgTie("/devices/status/keyboard/super", getModSuper);
+  fgTie("/devices/status/keyboard/hyper", getModHyper);
 
   _key_event->tie("key", SGRawValuePointer<int>(&_key_code));
   _key_event->tie("pressed", SGRawValuePointer<bool>(&_key_pressed));
@@ -174,6 +181,7 @@ FGInput::bind ()
   _key_event->tie("modifier/alt", SGRawValuePointer<bool>(&_key_alt));
   _key_event->tie("modifier/meta", SGRawValuePointer<bool>(&_key_meta));
   _key_event->tie("modifier/super", SGRawValuePointer<bool>(&_key_super));
+  _key_event->tie("modifier/hyper", SGRawValuePointer<bool>(&_key_hyper));
 }
 
 void
@@ -184,6 +192,7 @@ FGInput::unbind ()
   fgUntie("/devices/status/keyboard/alt");
   fgUntie("/devices/status/keyboard/meta");
   fgUntie("/devices/status/keyboard/super");
+  fgUntie("/devices/status/keyboard/hyper");
 
   _key_event->untie("key");
   _key_event->untie("pressed");
@@ -193,6 +202,7 @@ FGInput::unbind ()
   _key_event->untie("modifier/alt");
   _key_event->untie("modifier/meta");
   _key_event->untie("modifier/super");
+  _key_event->untie("modifier/hyper");
 }
 
 void 
@@ -247,6 +257,7 @@ FGInput::doKey (int k, int modifiers, int x, int y)
   _key_alt = bool(modifiers & KEYMOD_ALT);
   _key_meta = bool(modifiers & KEYMOD_META);
   _key_super = bool(modifiers & KEYMOD_SUPER);
+  _key_hyper = bool(modifiers & KEYMOD_HYPER);
   _key_event->fireValueChanged();
   if (!_key_code)
     return;
@@ -981,6 +992,10 @@ FGInput::_read_bindings (const SGPropertyNode * node,
   if (node->getChild("mod-super") != 0)
     _read_bindings(node->getChild("mod-super"), binding_list,
                    modifiers|KEYMOD_SUPER);
+
+  if (node->getChild("mod-hyper") != 0)
+    _read_bindings(node->getChild("mod-hyper"), binding_list,
+                   modifiers|KEYMOD_HYPER);
 }
 
 
diff --git a/src/Input/input.hxx b/src/Input/input.hxx
index eef9e2434..d6b75c5f1 100644
--- a/src/Input/input.hxx
+++ b/src/Input/input.hxx
@@ -341,6 +341,7 @@ private:
   bool _key_alt;
   bool _key_meta;
   bool _key_super;
+  bool _key_hyper;
 };
 
 #endif // _INPUT_HXX
diff --git a/src/Main/FGManipulator.cxx b/src/Main/FGManipulator.cxx
index a7b1c60bc..92465ce78 100644
--- a/src/Main/FGManipulator.cxx
+++ b/src/Main/FGManipulator.cxx
@@ -95,18 +95,23 @@ osg::Node* FGManipulator::getNode()
 static int osgToFGModifiers(int modifiers)
 {
     int result = 0;
-    if (modifiers & (osgGA::GUIEventAdapter::MODKEY_LEFT_SHIFT |
-		     osgGA::GUIEventAdapter::MODKEY_RIGHT_SHIFT))
-	result |= KEYMOD_SHIFT;
-    if (modifiers & (osgGA::GUIEventAdapter::MODKEY_LEFT_CTRL |
-		     osgGA::GUIEventAdapter::MODKEY_RIGHT_CTRL))
-	result |= KEYMOD_CTRL;
-    if (modifiers & (osgGA::GUIEventAdapter::MODKEY_LEFT_ALT |
-		     osgGA::GUIEventAdapter::MODKEY_RIGHT_ALT))
-	result |= KEYMOD_ALT;
-    if (modifiers & (osgGA::GUIEventAdapter::MODKEY_LEFT_META |
-		     osgGA::GUIEventAdapter::MODKEY_RIGHT_META))
-	result |= KEYMOD_META;
+    if (modifiers & osgGA::GUIEventAdapter::MODKEY_SHIFT)
+        result |= KEYMOD_SHIFT;
+
+    if (modifiers & osgGA::GUIEventAdapter::MODKEY_CTRL)
+        result |= KEYMOD_CTRL;
+
+    if (modifiers & osgGA::GUIEventAdapter::MODKEY_ALT)
+        result |= KEYMOD_ALT;
+
+    if (modifiers & osgGA::GUIEventAdapter::MODKEY_META)
+        result |= KEYMOD_META;
+
+    if (modifiers & osgGA::GUIEventAdapter::MODKEY_SUPER)
+        result |= KEYMOD_SUPER;
+
+    if (modifiers & osgGA::GUIEventAdapter::MODKEY_HYPER)
+        result |= KEYMOD_HYPER;
     return result;
 }
 
diff --git a/src/Main/fg_os.hxx b/src/Main/fg_os.hxx
index 43bea933a..48a29cdc6 100644
--- a/src/Main/fg_os.hxx
+++ b/src/Main/fg_os.hxx
@@ -29,7 +29,8 @@ enum { KEYMOD_NONE     = 0,
        KEYMOD_ALT      = 8,
        KEYMOD_META     = 16,
        KEYMOD_SUPER    = 32,
-       KEYMOD_MAX      = 64 };
+       KEYMOD_HYPER    = 64,
+       KEYMOD_MAX      = 128 };
 
 // A note on key codes: none are defined here.  FlightGear has no
 // hard-coded interpretations of codes other than modifier keys, so we