diff --git a/simgear/nasal/cppbind/NasalHash.cxx b/simgear/nasal/cppbind/NasalHash.cxx
index 71afefe0..1ad56d7d 100644
--- a/simgear/nasal/cppbind/NasalHash.cxx
+++ b/simgear/nasal/cppbind/NasalHash.cxx
@@ -130,4 +130,10 @@ namespace nasal
     return _keys;
   }
 
+  //----------------------------------------------------------------------------
+  bool Hash::isNil() const
+  {
+      return naIsNil(_hash);
+  }
+
 } // namespace nasal
diff --git a/simgear/nasal/cppbind/NasalHash.hxx b/simgear/nasal/cppbind/NasalHash.hxx
index 97c1e6cb..a9e6ead7 100644
--- a/simgear/nasal/cppbind/NasalHash.hxx
+++ b/simgear/nasal/cppbind/NasalHash.hxx
@@ -137,6 +137,8 @@ namespace nasal
        */
       int size() const;
 
+      bool isNil() const;
+
       /**
        * Get a list of all keys
        */