diff --git a/crates/rpc-types/src/eth/block.rs b/crates/rpc-types/src/eth/block.rs
index 8135a693e63..648cad252a1 100644
--- a/crates/rpc-types/src/eth/block.rs
+++ b/crates/rpc-types/src/eth/block.rs
@@ -308,7 +308,9 @@ impl Serialize for BlockNumberOrTag {
         S: Serializer,
     {
         match *self {
-            BlockNumberOrTag::Number(ref x) => serializer.serialize_str(&format!("0x{x:x}")),
+            BlockNumberOrTag::Number(ref x) => {
+                serializer.serialize_str(&format!("0x{:x}", x.to::<u64>()))
+            },
             BlockNumberOrTag::Latest => serializer.serialize_str("latest"),
             BlockNumberOrTag::Finalized => serializer.serialize_str("finalized"),
             BlockNumberOrTag::Safe => serializer.serialize_str("safe"),