diff --git a/journal/src/types.rs b/journal/src/types.rs
index 6fa5547..668ea3e 100644
--- a/journal/src/types.rs
+++ b/journal/src/types.rs
@@ -85,19 +85,6 @@ impl Add for StandardIngestionDose {
 	}
 }
 
-impl Add<UnknownIngestionDose> for StandardIngestionDose {
-	type Output = Self;
-
-	fn add(self, _rhs: UnknownIngestionDose) -> Self::Output {
-		StandardIngestionDose {
-			dose: self.dose,
-			unit: self.unit,
-			contains_unknown: true,
-			estimation: self.estimation,
-		}
-	}
-}
-
 impl Mul for StandardIngestionDose {
 	type Output = Self;