diff --git a/sub_crates/rmath/src/utils.rs b/sub_crates/rmath/src/utils.rs
index e6cbcd9..a48ca1d 100644
--- a/sub_crates/rmath/src/utils.rs
+++ b/sub_crates/rmath/src/utils.rs
@@ -8,16 +8,16 @@
 /// - If either number is NaN, returns `u32::MAX`.
 #[inline(always)]
 pub fn ulp_diff(a: f32, b: f32) -> u32 {
-    const TOP_BIT: u32 = 1 << 31;
+    const SIGN_BIT: u32 = 1 << 31;
     const INFINITY: u32 = 0x7f800000;
 
     let a = a.to_bits();
     let b = b.to_bits();
 
-    let a_sign = a & TOP_BIT;
-    let b_sign = b & TOP_BIT;
-    let a_abs = a & !TOP_BIT;
-    let b_abs = b & !TOP_BIT;
+    let a_sign = a & SIGN_BIT;
+    let b_sign = b & SIGN_BIT;
+    let a_abs = a & !SIGN_BIT;
+    let b_abs = b & !SIGN_BIT;
 
     if a_abs > INFINITY || b_abs > INFINITY {
         // NaNs always return maximum ulps apart.