diff --git a/powersoftau/src/bin/beacon_constrained.rs b/powersoftau/src/bin/beacon_constrained.rs
index 6af6ea9..34a1a47 100644
--- a/powersoftau/src/bin/beacon_constrained.rs
+++ b/powersoftau/src/bin/beacon_constrained.rs
@@ -27,7 +27,7 @@ fn main() {
     let response_filename = &args[2];
     let circuit_power = args[3].parse().expect("could not parse circuit power");
     let batch_size = args[4].parse().expect("could not parse batch size");
-    let beacon_hash = &args[5];
+    let beacon_hash = args[5];
 
     let parameters = CeremonyParams::<Bn256>::new(circuit_power, batch_size);
 
@@ -48,7 +48,7 @@ fn main() {
         use rand::chacha::ChaChaRng;
         use rand::SeedableRng;
 
-        let mut cur_hash = hex::decode(beacon_hash).unwrap();
+        let mut cur_hash: [u8; 32] = hex!(beacon_hash);
 
         // Performs 2^n hash iterations over it
         const N: u64 = 10;