diff --git a/substrate/frame/opf/src/functions.rs b/substrate/frame/opf/src/functions.rs
index 86dd3240a050..770151645847 100644
--- a/substrate/frame/opf/src/functions.rs
+++ b/substrate/frame/opf/src/functions.rs
@@ -265,7 +265,7 @@ impl<T: Config> Pallet<T> {
 	// To be executed in a hook, on_initialize
 	pub fn on_idle_function(now: BlockNumberFor<T>, limit: Weight) -> Weight {
 		let mut meter = WeightMeter::with_limit(limit);
-		let max_block_weight = Weight::from_parts(1000_u64, 0);
+		let max_block_weight = T::BlockWeights::get().max_block;
 
 		if meter.try_consume(max_block_weight).is_err() {
 			return meter.consumed();