diff --git a/crates/primitives/src/transaction/mod.rs b/crates/primitives/src/transaction/mod.rs
index cf7169a018..47a262705d 100644
--- a/crates/primitives/src/transaction/mod.rs
+++ b/crates/primitives/src/transaction/mod.rs
@@ -1209,7 +1209,7 @@ impl TransactionSigned {
 
         #[cfg(feature = "optimism")]
         let signature = if tx_type == DEPOSIT_TX_TYPE_ID {
-            Signature::default()
+            Signature::optimism_deposit_tx_signature()
         } else {
             Signature::decode(data)?
         };
@@ -1358,11 +1358,10 @@ impl proptest::arbitrary::Arbitrary for TransactionSigned {
                 }
 
                 #[cfg(feature = "optimism")]
-                let sig = if transaction.is_deposit() {
-                    Signature { r: crate::U256::ZERO, s: crate::U256::ZERO, odd_y_parity: false }
-                } else {
-                    sig
-                };
+                let sig = transaction
+                    .is_deposit()
+                    .then(Signature::optimism_deposit_tx_signature)
+                    .unwrap_or(sig);
 
                 let mut tx =
                     TransactionSigned { hash: Default::default(), signature: sig, transaction };
diff --git a/crates/primitives/src/transaction/signature.rs b/crates/primitives/src/transaction/signature.rs
index aaf2e0a869..76c4a893f6 100644
--- a/crates/primitives/src/transaction/signature.rs
+++ b/crates/primitives/src/transaction/signature.rs
@@ -19,6 +19,15 @@ pub struct Signature {
     pub odd_y_parity: bool,
 }
 
+impl Signature {
+    /// Returns the signature for the optimism deposit transactions, which don't include a
+    /// signature.
+    #[cfg(feature = "optimism")]
+    pub(crate) const fn optimism_deposit_tx_signature() -> Self {
+        Signature { r: U256::ZERO, s: U256::ZERO, odd_y_parity: false }
+    }
+}
+
 impl Compact for Signature {
     fn to_compact<B>(self, buf: &mut B) -> usize
     where