1 files changed, 2 insertions, 1 deletions

diff --git a/lstate.h b/lstate.h
index 5461b291..f08c2355 100644
--- a/lstate.h
+++ b/lstate.h
@@ -267,7 +267,8 @@ union GCUnion {
 #define gco2t(o)  check_exp((o)->tt == LUA_TTABLE, &((cast_u(o))->h))
 #define gco2p(o)  check_exp((o)->tt == LUA_TPROTO, &((cast_u(o))->p))
 #define gco2th(o)  check_exp((o)->tt == LUA_TTHREAD, &((cast_u(o))->th))
-#define gco2upv(o)  check_exp((o)->tt == LUA_TUPVAL, &((cast_u(o))->upv))
+#define gco2upv(o)  \
+        check_exp(novariant((o)->tt) == LUA_TUPVAL, &((cast_u(o))->upv))
 
 
 /*