diff --git a/argus/src/core/signals/interpolation.rs b/argus/src/core/signals/interpolation.rs
index 4119283..74dcf75 100644
--- a/argus/src/core/signals/interpolation.rs
+++ b/argus/src/core/signals/interpolation.rs
@@ -33,7 +33,7 @@ impl<T: Clone> InterpolationMethod<T> for Constant {
 /// If the signal does not have a value at a given point, a fixed value is returned
 pub struct DefaultFalse;
 
-impl InterpolationMethod<Bool> for DefaultFalse {
+impl<Bool> InterpolationMethod<Bool> for DefaultFalse {
     fn at(a: &Sample<Bool>, b: &Sample<Bool>, time: Duration) -> Option<Bool> {
         if time == b.time {
             Some(b.value.clone())