diff --git a/src/field/extension_field/quartic.rs b/src/field/extension_field/quartic.rs
index 16a11b52..7539b272 100644
--- a/src/field/extension_field/quartic.rs
+++ b/src/field/extension_field/quartic.rs
@@ -77,7 +77,7 @@ impl Field for QuarticCrandallField {
 
     const CHARACTERISTIC: u64 = CrandallField::CHARACTERISTIC;
     // Does not fit in 64-bits.
-    const ORDER: BigUint = CrandallField::ORDER.pow(4);
+    const ORDER: BigUint = CrandallField::ORDER.pow(4u32);
     const TWO_ADICITY: usize = 30;
     const MULTIPLICATIVE_GROUP_GENERATOR: Self = Self([
         CrandallField(12476589904174392631),
diff --git a/src/fri/mod.rs b/src/fri/mod.rs
index 87fe3db5..ab7137c2 100644
--- a/src/fri/mod.rs
+++ b/src/fri/mod.rs
@@ -10,8 +10,6 @@ const EPSILON: f64 = 0.01;
 pub struct FriConfig {
     pub proof_of_work_bits: u32,
 
-    pub rate_bits: usize,
-
     /// The arity of each FRI reduction step, expressed (i.e. the log2 of the actual arity).
     /// For example, `[3, 2, 1]` would describe a FRI reduction tree with 8-to-1 reduction, then
     /// a 4-to-1 reduction, then a 2-to-1 reduction. After these reductions, the reduced polynomial