diff --git a/src/api/api.c b/src/api/api.c
index 773d4682..f2785717 100644
--- a/src/api/api.c
+++ b/src/api/api.c
@@ -649,6 +649,7 @@ int luax_readscale(lua_State* L, int index, vec3 v, int components, const char*
       } else if (components == -2) { // -2 is special and means "2 components: xy and z"
         v[0] = v[1] = luax_tofloat(L, index);
         v[2] = luax_optfloat(L, index, 1.f);
+        return index + 2;
       } else {
         v[0] = v[1] = v[2] = 1.f;
         for (int i = 0; i < components; i++) {