diff --git a/crypto/evrf/secq256k1/src/backend.rs b/crypto/evrf/secq256k1/src/backend.rs
index b7cb8132..bcb36bbc 100644
--- a/crypto/evrf/secq256k1/src/backend.rs
+++ b/crypto/evrf/secq256k1/src/backend.rs
@@ -74,6 +74,7 @@ macro_rules! field {
     $MODULUS: ident,
     $WIDE_MODULUS: ident,
 
+    $NUM_BITS: literal,
     $MULTIPLICATIVE_GENERATOR: literal,
     $S: literal,
     $ROOT_OF_UNITY: literal,
@@ -212,8 +213,8 @@ macro_rules! field {
 
       const MODULUS: &'static str = $MODULUS_STR;
 
-      const NUM_BITS: u32 = 256;
-      const CAPACITY: u32 = 255;
+      const NUM_BITS: u32 = $NUM_BITS;
+      const CAPACITY: u32 = $NUM_BITS - 1;
 
       const TWO_INV: Self = $FieldName($ResidueType::new(&U256::from_u8(2)).invert().0);
 
diff --git a/crypto/evrf/secq256k1/src/point.rs b/crypto/evrf/secq256k1/src/point.rs
index f05949e9..8f3a4730 100644
--- a/crypto/evrf/secq256k1/src/point.rs
+++ b/crypto/evrf/secq256k1/src/point.rs
@@ -229,7 +229,7 @@ impl Group for Point {
     let RR = R * R;
     let B = X1 + R;
     let B = (B * B) - XX - RR;
-    let h = (w * w) -  B.double();
+    let h = (w * w) - B.double();
     let X3 = h * s;
     let Y3 = w * (B - h) - RR.double();
     let Z3 = sss;
diff --git a/crypto/evrf/secq256k1/src/scalar.rs b/crypto/evrf/secq256k1/src/scalar.rs
index 4e495ede..ee1a2206 100644
--- a/crypto/evrf/secq256k1/src/scalar.rs
+++ b/crypto/evrf/secq256k1/src/scalar.rs
@@ -32,6 +32,7 @@ field!(
   MODULUS_STR,
   MODULUS,
   WIDE_MODULUS,
+  256,
   3,
   1,
   "fffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2e",