diff --git a/rust/xaynet-mobile/src/settings.rs b/rust/xaynet-mobile/src/settings.rs
index 50eab8532..f5baa9e22 100644
--- a/rust/xaynet-mobile/src/settings.rs
+++ b/rust/xaynet-mobile/src/settings.rs
@@ -46,8 +46,11 @@ impl Settings {
     }
 
     /// Set the scalar to use for masking
+    ///
+    /// # Panics
+    /// Panics if a `Scalar` cannot be constructed from the given `scalar`.
     pub fn set_scalar(&mut self, scalar: f64) {
-        self.scalar = Scalar::from_primitive(scalar).unwrap() // FIXME better to avoid f64
+        self.scalar = Scalar::from_primitive(scalar).unwrap()
     }
 
     /// Set the Xaynet coordinator address