diff --git a/engine/src/engine.rs b/engine/src/engine.rs
index ad23631d8..b4132996c 100644
--- a/engine/src/engine.rs
+++ b/engine/src/engine.rs
@@ -144,7 +144,7 @@ impl EngineErrorKind {
             Self::MaxPriorityGasFeeTooLarge => errors::ERR_MAX_PRIORITY_FEE_GREATER,
             Self::GasPayment(e) => e.as_ref(),
             Self::GasOverflow => errors::ERR_GAS_OVERFLOW,
-            Self::NonExistedKey => errors::ERR_FUNCTIONAL_KEY_NOT_FOUND,
+            Self::NonExistedKey => errors::ERR_FUNCTION_CALL_KEY_NOT_FOUND,
             Self::EvmFatal(_) | Self::EvmError(_) => unreachable!(), // unused misc
         }
     }
@@ -2293,7 +2293,7 @@ mod tests {
     }
 
     #[test]
-    fn test_add_remove_functional_call_key() {
+    fn test_add_remove_function_call_key() {
         let storage = RefCell::new(Storage::default());
         let mut io = StoragePointer(&storage);
         let public_key = serde_json::from_str::<RelayerKeyArgs>(
diff --git a/engine/src/errors.rs b/engine/src/errors.rs
index 605d7471a..c2bc58e42 100644
--- a/engine/src/errors.rs
+++ b/engine/src/errors.rs
@@ -88,6 +88,6 @@ pub const ERR_FAILED_UNREGISTER_ACCOUNT_POSITIVE_BALANCE: &[u8; 46] =
     b"ERR_FAILED_UNREGISTER_ACCOUNT_POSITIVE_BALANCE";
 pub const ERR_SAME_OWNER: &[u8; 14] = b"ERR_SAME_OWNER";
 pub const ERR_SAME_KEY_MANAGER: &[u8] = b"ERR_SAME_KEY_MANAGER";
-pub const ERR_FUNCTIONAL_KEY_NOT_FOUND: &[u8] = b"ERR_FUNCTION_CALL_KEY_NOT_FOUND";
+pub const ERR_FUNCTION_CALL_KEY_NOT_FOUND: &[u8] = b"ERR_FUNCTION_CALL_KEY_NOT_FOUND";
 pub const ERR_KEY_MANAGER_IS_NOT_SET: &[u8] = b"ERR_KEY_MANAGER_IS_NOT_SET";
 pub const ERR_ACCOUNTS_COUNTER_OVERFLOW: &str = "ERR_ACCOUNTS_COUNTER_OVERFLOW";