diff --git a/.gitignore b/.gitignore
index 35e2c35..d71302b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,5 +16,6 @@
 *.obj
 *.exp
 *.dll
+*.rock
 .cache/
 compile_commands.json
diff --git a/luakiwi/luakiwi.cpp b/luakiwi/luakiwi.cpp
index 89ffa8a..42bcce2 100644
--- a/luakiwi/luakiwi.cpp
+++ b/luakiwi/luakiwi.cpp
@@ -266,7 +266,8 @@ inline ConstraintData* constraint_new(
    push_type(L, CONSTRAINT);
    lua_setmetatable(L, -2);
 
-   if (lk_unlikely(!(*c = kiwi_constraint_new(lhs, rhs, op, strength)))) {
+   *c = kiwi_constraint_new(lhs, rhs, op, strength);
+   if (lk_unlikely(!*c)) {
       lua_rawgeti(L, lua_upvalueindex(1), MEM_ERR_MSG);
       lua_error(L);
    }