diff --git a/src/osgPlugins/lua/LuaScriptEngine.cpp b/src/osgPlugins/lua/LuaScriptEngine.cpp
index 66f23ca4b..15be805d1 100644
--- a/src/osgPlugins/lua/LuaScriptEngine.cpp
+++ b/src/osgPlugins/lua/LuaScriptEngine.cpp
@@ -3543,6 +3543,7 @@ bool LuaScriptEngine::getValue(int pos, osg::Matrixf& value) const
             value(r,c) = lua_tonumber(_lua, -16+(r*4+c));
         }
     }
+    lua_pop(_lua, 16);
     return true;
 }