diff --git a/storage/src/nullifier.rs b/storage/src/nullifier.rs
index 7dc0123b..fda25e66 100644
--- a/storage/src/nullifier.rs
+++ b/storage/src/nullifier.rs
@@ -4,40 +4,40 @@ use EpochTag;
 /// Nullifier.
 #[derive(Debug, Clone, Copy, PartialEq)]
 pub struct Nullifier {
-    tag: EpochTag,
-    hash: H256,
+	tag: EpochTag,
+	hash: H256,
 }
 
 /// Trait to query existing nullifier.
 pub trait NullifierTracker : Sync {
-    fn contains_nullifier(&self, nullifier: Nullifier) -> bool;
+	fn contains_nullifier(&self, nullifier: Nullifier) -> bool;
 }
 
 impl Nullifier {
-    /// New nullifer.
-    pub fn new(tag: EpochTag, hash: H256) -> Self {
-        Nullifier {
-            tag: tag,
-            hash: hash,
-        }
-    }
+	/// New nullifer.
+	pub fn new(tag: EpochTag, hash: H256) -> Self {
+		Nullifier {
+			tag: tag,
+			hash: hash,
+		}
+	}
 
-    /// Nullifer tag
-    pub fn tag(&self) -> EpochTag {
-        self.tag
-    }
+	/// Nullifer tag
+	pub fn tag(&self) -> EpochTag {
+		self.tag
+	}
 
-    /// Nullifer hash
-    pub fn hash(&self) -> &H256 {
-        &self.hash
-    }
+	/// Nullifer hash
+	pub fn hash(&self) -> &H256 {
+		&self.hash
+	}
 }
 
 impl From<(EpochTag, H256)> for Nullifier {
-    fn from(tuple: (EpochTag, H256)) -> Self {
-        Nullifier {
-            tag: tuple.0,
-            hash: tuple.1,
-        }
-    }
+	fn from(tuple: (EpochTag, H256)) -> Self {
+		Nullifier {
+			tag: tuple.0,
+			hash: tuple.1,
+		}
+	}
 }
\ No newline at end of file