diff --git a/crates/evm/src/query.rs b/crates/evm/src/query.rs
index a08253cd7..0e75f84dd 100644
--- a/crates/evm/src/query.rs
+++ b/crates/evm/src/query.rs
@@ -231,7 +231,7 @@ impl<C: sov_modules_api::Context> Evm<C> {
             other: OtherFields::new(BTreeMap::<String, _>::from([
                 (
                     "l1FeeRate".to_string(),
-                    serde_json::json!(sealed_block.l1_fee_rate),
+                    format!("{:#x}", sealed_block.l1_fee_rate).into(),
                 ),
                 (
                     "l1Hash".to_string(),
diff --git a/crates/evm/src/tests/queries/basic_queries.rs b/crates/evm/src/tests/queries/basic_queries.rs
index 51428fb72..26504b7e1 100644
--- a/crates/evm/src/tests/queries/basic_queries.rs
+++ b/crates/evm/src/tests/queries/basic_queries.rs
@@ -506,10 +506,9 @@ fn check_against_third_block(block: &AnyNetworkBlock) {
         other: OtherFields::new(BTreeMap::new()),
     };
 
-    rich_block.other.insert(
-        "l1FeeRate".to_string(),
-        serde_json::Value::Number(serde_json::Number::from(1)),
-    );
+    rich_block
+        .other
+        .insert("l1FeeRate".to_string(), "0x1".into());
 
     rich_block.other.insert(
         "l1Hash".to_string(),