diff --git a/toolkit/primitives/domain/src/lib.rs b/toolkit/primitives/domain/src/lib.rs
index 9833c30c2..2b5c7a197 100644
--- a/toolkit/primitives/domain/src/lib.rs
+++ b/toolkit/primitives/domain/src/lib.rs
@@ -220,14 +220,14 @@ impl MainchainPrivateKey {
 	#[cfg(feature = "std")]
 	pub fn to_pub_key_hash(&self) -> MainchainAddressHash {
 		cardano_serialization_lib::PrivateKey::from_normal_bytes(&self.0)
-			.expect("impossible")
+			.expect("Conversion cannot fail on valid MainchainPrivateKey values")
 			.to_public()
 			.hash()
 			.to_bytes()
 			.as_slice()
 			.try_into()
 			.map(MainchainAddressHash)
-			.expect("impossible")
+			.expect("Conversion cannot fail as representation is the same")
 	}
 }