diff --git a/3rdparty/lua/src/lundump.c b/3rdparty/lua/src/lundump.c
index 4080af9c0d9..71bb1512142 100644
--- a/3rdparty/lua/src/lundump.c
+++ b/3rdparty/lua/src/lundump.c
@@ -234,7 +234,7 @@ static void fchecksize (LoadState *S, size_t size, const char *tname) {
 #define checksize(S,t)	fchecksize(S,sizeof(t),#t)
 
 static void checkHeader (LoadState *S) {
-  checkliteral(S, LUA_SIGNATURE + 1, "not a");  /* 1st char already checked */
+  checkliteral(S, (const char *)(LUA_SIGNATURE) + 1, "not a");  /* 1st char already checked */
   if (LoadByte(S) != LUAC_VERSION)
     error(S, "version mismatch in");
   if (LoadByte(S) != LUAC_FORMAT)