diff --git a/crates/fj-math/src/scalar.rs b/crates/fj-math/src/scalar.rs
index 1c89648f2..3d618e114 100644
--- a/crates/fj-math/src/scalar.rs
+++ b/crates/fj-math/src/scalar.rs
@@ -159,7 +159,9 @@ impl Scalar {
 
 impl PartialEq for Scalar {
     fn eq(&self, other: &Self) -> bool {
-        self.value == other.value
+        // Using `R64` here to make sure that this matches the `Eq`/`PartialEq`
+        // implementation, as required by `Hash`.
+        R64::from_inner(self.value).eq(&R64::from_inner(other.value))
     }
 }