diff --git a/eth2/types/src/beacon_state/winning_root.rs b/eth2/types/src/beacon_state/winning_root.rs
index 20fdca09b..1b891af73 100644
--- a/eth2/types/src/beacon_state/winning_root.rs
+++ b/eth2/types/src/beacon_state/winning_root.rs
@@ -100,7 +100,7 @@ impl BeaconState {
 }
 
 impl From<AttestationParticipantsError> for Error {
-    fn from (e: AttestationParticipantsError) -> Error {
+    fn from(e: AttestationParticipantsError) -> Error {
         Error::AttestationParticipantsError(e)
     }
 }