diff --git a/code/nel/include/nel/gui/lua_helper.h b/code/nel/include/nel/gui/lua_helper.h
index 10b78daa8..d35a1a6df 100644
--- a/code/nel/include/nel/gui/lua_helper.h
+++ b/code/nel/include/nel/gui/lua_helper.h
@@ -217,6 +217,9 @@ namespace NLGUI
 		void				clear() { setTop(0); }
 		int					getTop();
 		bool				empty() { return getTop() == 0; }
+#if LUA_VERSION_NUM >= 502 
+		void				pushGlobalTable();		
+#endif
 		void				pushValue(int index);  // copie nth element of stack to the top of the stack
 		void				remove(int index);     // remove nth element of stack
 		void				insert(int index);     // insert last element of the stack before the given position
@@ -301,7 +304,8 @@ namespace NLGUI
 		/** Helper : Execute a function by name. Lookup for the function is done in the table at the index 'funcTableIndex'
 		  * the behaviour is the same than with call of pcall.
 		  */
-		int                 pcallByName(const char *functionName, int nargs, int nresults, int funcTableIndex = LUA_GLOBALSINDEX, int errfunc = 0);
+		int                 pcallByNameGlobal(const char *functionName, int nargs, int nresults, int errfunc = 0);
+		int                 pcallByName(const char *functionName, int nargs, int nresults, int funcTableIndex, int errfunc = 0);
 
 		// push a C closure (pop n element from the stack and associate with the function)
 		void				pushCClosure(lua_CFunction function, int n);
@@ -367,6 +371,7 @@ namespace NLGUI
 		CLuaState &operator=(const CLuaState &/* other */) { nlassert(0); return *this; }
 
 		void				executeScriptInternal(const std::string &code, const std::string &dbgSrc, int numRet = 0);
+		int                 pcallByNameInternal(const char *functionName, int nargs, int nresults, int errfunc, int initialStackSize);
 
 	};
 
diff --git a/code/nel/include/nel/gui/lua_helper_inline.h b/code/nel/include/nel/gui/lua_helper_inline.h
index 0b9113ce1..60cb00ec4 100644
--- a/code/nel/include/nel/gui/lua_helper_inline.h
+++ b/code/nel/include/nel/gui/lua_helper_inline.h
@@ -42,10 +42,16 @@ inline void CLuaState::checkIndex(int index)
 	//H_AUTO(Lua_CLuaState_checkIndex)
 	// NB : more restrictive test that in the documentation there, because
 	// we don't expose the check stack function
+#if LUA_VERSION_NUM >= 502
+	nlassert( (index!=0 && abs(index) <= getTop())
+		|| index == LUA_REGISTRYINDEX
+		);
+#else
 	nlassert( (index!=0 && abs(index) <= getTop())
 		|| index == LUA_REGISTRYINDEX
 		|| index == LUA_GLOBALSINDEX
 		);
+#endif
 }
 
 //================================================================================
@@ -75,6 +81,15 @@ inline void CLuaState::setTop(int index)
 	lua_settop(_State, index);
 }
 
+#if LUA_VERSION_NUM >= 502
+//================================================================================
+inline void CLuaState::pushGlobalTable()
+{
+	//H_AUTO(Lua_CLuaState_pushGlobalTable)
+	lua_pushglobaltable(_State);
+}
+#endif
+
 //================================================================================
 inline void CLuaState::pushValue(int index)
 {
@@ -243,7 +258,11 @@ inline size_t CLuaState::strlen(int index)
 {
 	//H_AUTO(Lua_CLuaState_strlen)
 	checkIndex(index);
+#if LUA_VERSION_NUM >= 502
+	return lua_rawlen(_State, index);
+#else
 	return lua_strlen(_State, index);
+#endif
 }
 
 //================================================================================
@@ -342,7 +361,11 @@ inline bool         CLuaState::equal(int index1, int index2)
 	//H_AUTO(Lua_CLuaState_equal)
 	checkIndex(index1);
 	checkIndex(index2);
+#if LUA_VERSION_NUM >= 502
+	return lua_compare(_State, index1, index2, LUA_OPEQ) != 0;
+#else
 	return lua_equal(_State, index1, index2) != 0;
+#endif
 }
 
 //================================================================================
@@ -376,7 +399,11 @@ inline bool         CLuaState::lessThan(int index1, int index2)
 	//H_AUTO(Lua_CLuaState_lessThan)
 	checkIndex(index1);
 	checkIndex(index2);
+#if LUA_VERSION_NUM >= 502
+	return lua_compare(_State, index1, index2, LUA_OPLT) != 0;
+#else
 	return lua_lessthan(_State, index1, index2) != 0;
+#endif
 }
 
 
diff --git a/code/nel/src/gui/lua_helper.cpp b/code/nel/src/gui/lua_helper.cpp
index bc800725b..16dca8d7a 100644
--- a/code/nel/src/gui/lua_helper.cpp
+++ b/code/nel/src/gui/lua_helper.cpp
@@ -361,7 +361,11 @@ namespace NLGUI
 		rd.Str = &code;
 		rd.Done = false;
 
-		int result = lua_load(_State,   CHelper::luaChunkReaderFromString,   (void *) &rd,   dbgSrc.c_str());
+		int result = lua_load(_State,   CHelper::luaChunkReaderFromString,   (void *) &rd,   dbgSrc.c_str()
+#if LUA_VERSION_NUM >= 502
+			, NULL
+#endif
+			);
 		if (result !=0)
 		{
 			// pop the error code
@@ -569,9 +573,17 @@ namespace NLGUI
 		//H_AUTO(Lua_CLuaState_registerFunc)
 		nlassert(function);
 		CLuaStackChecker lsc(this);
+#if LUA_VERSION_NUM >= 502
+		pushGlobalTable();
+#endif
 		push(name);
 		push(function);
+#if LUA_VERSION_NUM >= 502
+		setTable(-3); // -3 is the pushGlobalTable
+		pop(1); // pop the pushGlobalTable value (setTable popped the 2 pushes)
+#else
 		setTable(LUA_GLOBALSINDEX);
+#endif
 	}
 
 
@@ -643,13 +655,31 @@ namespace NLGUI
 	}
 
 	// ***************************************************************************
-	int CLuaState::pcallByName(const char *functionName,   int nargs,   int nresults,   int funcTableIndex /*=LUA_GLOBALSINDEX*/,  int errfunc /*= 0*/)
+	int CLuaState::pcallByNameGlobal(const char *functionName, int nargs, int nresults, int errfunc /*= 0*/)
+	{
+		int initialStackSize = getTop();
+		nlassert(functionName);
+#if LUA_VERSION_NUM >= 502
+		pushGlobalTable();
+#else
+		nlassert(isTable(LUA_GLOBALSINDEX));
+		pushValue(LUA_GLOBALSINDEX);
+#endif
+		return pcallByNameInternal(functionName, nargs, nresults, errfunc, initialStackSize);
+	}
+
+	int CLuaState::pcallByName(const char *functionName,   int nargs,   int nresults,   int funcTableIndex,  int errfunc /*= 0*/)
 	{
-		//H_AUTO(Lua_CLuaState_pcallByName)
 		int initialStackSize = getTop();
 		nlassert(functionName);
 		nlassert(isTable(funcTableIndex));
 		pushValue(funcTableIndex);
+		return pcallByNameInternal(functionName, nargs, nresults, errfunc, initialStackSize);
+	}
+
+	int CLuaState::pcallByNameInternal(const char *functionName,   int nargs,   int nresults,  int errfunc /*= 0*/, int initialStackSize)
+	{
+		//H_AUTO(Lua_CLuaState_pcallByName)
 		push(functionName);
 		getTable(-2);
 		remove(-2); // get rid of the table
@@ -782,7 +812,12 @@ namespace NLGUI
 	int          CLuaState::getGCCount()
 	{
 		//H_AUTO(Lua_CLuaState_getGCCount)
+#if LUA_VERSION_NUM >= 502
+		// deprecated
+		return 0;
+#else
 		return lua_getgccount(_State);
+#endif
 	}
 
 	//================================================================================
diff --git a/code/nel/src/gui/lua_object.cpp b/code/nel/src/gui/lua_object.cpp
index a7bbbb7f8..3f8924517 100644
--- a/code/nel/src/gui/lua_object.cpp
+++ b/code/nel/src/gui/lua_object.cpp
@@ -474,7 +474,11 @@ namespace NLGUI
 		CLuaState *luaState = table.getLuaState();
 		CLuaStackChecker lsc(luaState);
 		// get pointer to the 'next' function
+#if LUA_VERSION_NUM >= 502
+		luaState->pushGlobalTable();
+#else
 		luaState->pushValue(LUA_GLOBALSINDEX);
+#endif
 		_NextFunction = CLuaObject(*luaState)["next"];
 		//
 		nlassert(luaState);