diff --git a/src/controller/model_utils/signal_reducer.rs b/src/controller/model_utils/signal_reducer.rs
index be5604b..bee4d47 100644
--- a/src/controller/model_utils/signal_reducer.rs
+++ b/src/controller/model_utils/signal_reducer.rs
@@ -1,3 +1,7 @@
+use crate::model::Frequency;
+
+use gio::{prelude::Cast, ListStore};
+
 #[allow(non_snake_case)]
 pub fn reactive_resistance_of_capacitor(Cm: f64, L: f64, f: f64) -> f64 {
     if f == 0.0 || Cm == 0.0 || L == 0.0 {