diff --git a/bn254/src/fields/fr.rs b/bn254/src/fields/fr.rs
index b79e33f..dae25ff 100644
--- a/bn254/src/fields/fr.rs
+++ b/bn254/src/fields/fr.rs
@@ -3,5 +3,7 @@ use ark_ff::fields::{Fp256, MontBackend, MontConfig};
 #[derive(MontConfig)]
 #[modulus = "21888242871839275222246405745257275088548364400416034343698204186575808495617"]
 #[generator = "5"]
+#[small_subgroup_base = "3"]
+#[small_subgroup_power = "2"]
 pub struct FrConfig;
 pub type Fr = Fp256<MontBackend<FrConfig, 4>>;