diff --git a/src/common/runtime.cpp b/src/common/runtime.cpp
index fcb4d1046..a053b8dd6 100644
--- a/src/common/runtime.cpp
+++ b/src/common/runtime.cpp
@@ -775,7 +775,7 @@ Variant luax_checkvariant(lua_State *L, int n, bool allowuserdata, std::set<cons
 
 			Variant::SharedTable *table = new Variant::SharedTable();
 
-			size_t len = luax_objlen(L, -1);
+			size_t len = luax_objlen(L, n);
 			if (len > 0)
 				table->pairs.reserve(len);