diff --git a/igneum-pow/src/generator.rs b/igneum-pow/src/generator.rs
index 00a05124b..1ca1d894b 100644
--- a/igneum-pow/src/generator.rs
+++ b/igneum-pow/src/generator.rs
@@ -404,7 +404,7 @@ impl LoadClass {
     /// the per-warp verify stays under 10 ms on one Mac core and the daily 1 GiB build under 1 s on every card):
     /// the same loads and growth rule, the mixer applied 8 times per round. Name "mx8".
     pub const MX8: LoadClass =
-        LoadClass { mix: [100, 0, 0], load_slots: LOAD_SLOTS as u8, scratch: None, scratch_kb: 0, mixer_mult: 8, growth: true };
+        LoadClass { mix: [100, 0, 0], load_slots: LOAD_SLOTS as u8, scratch: None, scratch_kb: 0, mixer_mult: 8, growth: true, era: None, hot: None };
 
     /// A fixed width (1, 4 or 16 words) with `load_slots` loads per program.
     pub fn fixed(width_words: u8, load_slots: u8) -> LoadClass {