diff --git a/radio/src/thirdparty/Lua/src/lcorolib.c b/radio/src/thirdparty/Lua/src/lcorolib.c
index 6bd1e2c19..e2f601eb6 100644
--- a/radio/src/thirdparty/Lua/src/lcorolib.c
+++ b/radio/src/thirdparty/Lua/src/lcorolib.c
@@ -142,7 +142,7 @@ static const luaL_Reg co_funcs[] = {
   {"status", luaB_costatus},
   {"wrap", luaB_cowrap},
   {"yield", luaB_yield},
-  {nullptr, nullptr}
+  {NULL, NULL}
 };
 
 
diff --git a/radio/src/thirdparty/Lua/src/llex.c b/radio/src/thirdparty/Lua/src/llex.c
index 737cbb9e0..1a32e348b 100644
--- a/radio/src/thirdparty/Lua/src/llex.c
+++ b/radio/src/thirdparty/Lua/src/llex.c
@@ -160,7 +160,7 @@ void luaX_setinput (lua_State *L, LexState *ls, ZIO *z, TString *source,
   ls->current = firstchar;
   ls->lookahead.token = TK_EOS;  /* no look-ahead token */
   ls->z = z;
-  ls->fs = nullptr;
+  ls->fs = NULL;
   ls->linenumber = 1;
   ls->lastline = 1;
   ls->source = source;
@@ -416,7 +416,7 @@ static int llex (LexState *ls, SemInfo *seminfo) {
           int sep = skip_sep(ls);
           luaZ_resetbuffer(ls->buff);  /* `skip_sep' may dirty the buffer */
           if (sep >= 0) {
-            read_long_string(ls, nullptr, sep);  /* skip long comment */
+            read_long_string(ls, NULL, sep);  /* skip long comment */
             luaZ_resetbuffer(ls->buff);  /* previous call may dirty the buff. */
             break;
           }