diff --git a/units/src/fee_rate.rs b/units/src/fee_rate.rs
index d6b4c33cb..b605b14b1 100644
--- a/units/src/fee_rate.rs
+++ b/units/src/fee_rate.rs
@@ -194,19 +194,19 @@ impl Add for FeeRate {
 impl Add<FeeRate> for &FeeRate {
     type Output = FeeRate;
 
-    fn add(self, other: FeeRate) -> <FeeRate as Add>::Output { FeeRate(self.0 + other.0) }
+    fn add(self, other: FeeRate) -> Self::Output { FeeRate(self.0 + other.0) }
 }
 
 impl Add<&FeeRate> for FeeRate {
     type Output = FeeRate;
 
-    fn add(self, other: &FeeRate) -> <FeeRate as Add>::Output { FeeRate(self.0 + other.0) }
+    fn add(self, other: &FeeRate) -> Self::Output { FeeRate(self.0 + other.0) }
 }
 
 impl<'a> Add<&'a FeeRate> for &FeeRate {
     type Output = FeeRate;
 
-    fn add(self, other: &'a FeeRate) -> <FeeRate as Add>::Output { FeeRate(self.0 + other.0) }
+    fn add(self, other: &'a FeeRate) -> Self::Output { FeeRate(self.0 + other.0) }
 }
 
 impl Sub for FeeRate {
@@ -218,19 +218,19 @@ impl Sub for FeeRate {
 impl Sub<FeeRate> for &FeeRate {
     type Output = FeeRate;
 
-    fn sub(self, other: FeeRate) -> <FeeRate as Add>::Output { FeeRate(self.0 - other.0) }
+    fn sub(self, other: FeeRate) -> Self::Output { FeeRate(self.0 - other.0) }
 }
 
 impl Sub<&FeeRate> for FeeRate {
     type Output = FeeRate;
 
-    fn sub(self, other: &FeeRate) -> <FeeRate as Add>::Output { FeeRate(self.0 - other.0) }
+    fn sub(self, other: &FeeRate) -> Self::Output { FeeRate(self.0 - other.0) }
 }
 
 impl<'a> Sub<&'a FeeRate> for &FeeRate {
     type Output = FeeRate;
 
-    fn sub(self, other: &'a FeeRate) -> <FeeRate as Add>::Output { FeeRate(self.0 - other.0) }
+    fn sub(self, other: &'a FeeRate) -> Self::Output { FeeRate(self.0 - other.0) }
 }
 
 /// Computes the ceiling so that the fee computation is conservative.