diff --git a/src/num.rs b/src/num.rs
index d36e286..b1e0b03 100644
--- a/src/num.rs
+++ b/src/num.rs
@@ -2,8 +2,6 @@ use num_traits::{AsPrimitive, Float, Num};
 
 /// Helper trait unifying fixed point and floating point coefficients/samples
 pub trait FilterNum: 'static + Copy + Num + AsPrimitive<Self::ACCU> {
-    /// Scale
-    const SHIFT: u32;
     /// Multiplicative identity
     const ONE: Self;
     /// Negative multiplicative identity, equal to `-Self::ONE`.
@@ -40,7 +38,6 @@ pub trait FilterNum: 'static + Copy + Num + AsPrimitive<Self::ACCU> {
 macro_rules! impl_float {
     ($T:ty) => {
         impl FilterNum for $T {
-            const SHIFT: u32 = 0;
             const ONE: Self = 1.0;
             const NEG_ONE: Self = -1.0;
             const ZERO: Self = 0.0;
@@ -82,7 +79,6 @@ impl_float!(f64);
 macro_rules! impl_int {
     ($T:ty, $U:ty, $A:ty, $Q:literal) => {
         impl FilterNum for $T {
-            const SHIFT: u32 = $Q;
             const ONE: Self = 1 << $Q;
             const NEG_ONE: Self = -1 << $Q;
             const ZERO: Self = 0;