diff --git a/packages/fortifier-macros-tests/tests/validations/custom/options_pass.rs b/packages/fortifier-macros-tests/tests/validations/custom/options_pass.rs
index af1abf7..1a9e3cb 100644
--- a/packages/fortifier-macros-tests/tests/validations/custom/options_pass.rs
+++ b/packages/fortifier-macros-tests/tests/validations/custom/options_pass.rs
@@ -35,7 +35,7 @@ struct CustomData<'a> {
     strip_to_two_options_from_three: Option<Option<Option<&'a str>>>,
 }
 
-error_code!(CustomErrorCode, "custom");
+error_code!(CustomErrorCode, CUSTOM_ERROR_CODE, "custom");
 
 #[derive(Debug, Deserialize, PartialEq, Serialize)]
 #[serde(rename_all = "camelCase")]
diff --git a/packages/fortifier/src/error_code.rs b/packages/fortifier/src/error_code.rs
index 01a37dc..caeecb7 100644
--- a/packages/fortifier/src/error_code.rs
+++ b/packages/fortifier/src/error_code.rs
@@ -2,10 +2,10 @@
 /// Implement an error code.
 #[macro_export]
 macro_rules! error_code {
-    ($name:ident, $code:literal) => {
-        $crate::error_code_base!($name, $code);
-        $crate::error_code_serde!($name, $code);
-        $crate::error_code_utoipa!($name, $code);
+    ($name:ident, $code_name:ident, $code:literal) => {
+        $crate::error_code_base!($name, $code_name, $code);
+        $crate::error_code_serde!($name, $code_name, $code);
+        $crate::error_code_utoipa!($name, $code_name, $code);
     };
 }
 
@@ -13,9 +13,9 @@ macro_rules! error_code {
 /// Implement an error code.
 #[macro_export]
 macro_rules! error_code {
-    ($name:ident, $code:literal) => {
-        $crate::error_code_base!($name, $code);
-        $crate::error_code_serde!($name, $code);
+    ($name:ident, $code_name:ident, $code:literal) => {
+        $crate::error_code_base!($name, $code_name, $code);
+        $crate::error_code_serde!($name, $code_name, $code);
     };
 }
 
@@ -23,9 +23,9 @@ macro_rules! error_code {
 /// Implement an error code.
 #[macro_export]
 macro_rules! error_code {
-    ($name:ident, $code:literal) => {
-        $crate::error_code_base!($name, $code);
-        $crate::error_code_utoipa!($name, $code);
+    ($name:ident, $code_name:ident, $code:literal) => {
+        $crate::error_code_base!($name, $code_name, $code);
+        $crate::error_code_utoipa!($name, $code_name, $code);
     };
 }
 
@@ -33,16 +33,16 @@ macro_rules! error_code {
 /// Implement an error code.
 #[macro_export]
 macro_rules! error_code {
-    ($name:ident, $code:literal) => {
-        $crate::error_code_base!($name, $code);
+    ($name:ident, $code_name:ident, $code:literal) => {
+        $crate::error_code_base!($name, $code_name, $code);
     };
 }
 
 /// Implement an error code.
 #[macro_export]
 macro_rules! error_code_base {
-    ($name:ident, $code:literal) => {
-        const CODE: &str = $code;
+    ($name:ident, $code_name:ident, $code:literal) => {
+        const $code_name: &str = $code;
 
         /// Email address error code.
         #[derive(Eq, PartialEq)]
@@ -58,7 +58,7 @@ macro_rules! error_code_base {
             type Target = str;
 
             fn deref(&self) -> &Self::Target {
-                CODE
+                $code_name
             }
         }
 
@@ -74,14 +74,14 @@ macro_rules! error_code_base {
 #[cfg(feature = "serde")]
 #[macro_export]
 macro_rules! error_code_serde {
-    ($name:ident, $code:literal) => {
+    ($name:ident, $code_name:ident, $code:literal) => {
         impl<'de> ::serde::Deserialize<'de> for $name {
             fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
             where
                 D: ::serde::Deserializer<'de>,
             {
                 deserializer
-                    .deserialize_any($crate::serde::MustBeStrVisitor(CODE))
+                    .deserialize_any($crate::serde::MustBeStrVisitor($code_name))
                     .map(|()| Self)
             }
         }
@@ -91,7 +91,7 @@ macro_rules! error_code_serde {
             where
                 S: ::serde::Serializer,
             {
-                serializer.serialize_str(CODE)
+                serializer.serialize_str($code_name)
             }
         }
     };
@@ -101,12 +101,12 @@ macro_rules! error_code_serde {
 #[cfg(feature = "utoipa")]
 #[macro_export]
 macro_rules! error_code_utoipa {
-    ($name:ident, $code:literal) => {
+    ($name:ident, $code_name:ident, $code:literal) => {
         impl ::utoipa::PartialSchema for $name {
             fn schema() -> ::utoipa::openapi::RefOr<::utoipa::openapi::schema::Schema> {
                 ::utoipa::openapi::schema::ObjectBuilder::new()
                     .schema_type(::utoipa::openapi::schema::Type::String)
-                    .enum_values(Some([CODE]))
+                    .enum_values(Some([$code_name]))
                     .build()
                     .into()
             }
diff --git a/packages/fortifier/src/validations/email_address.rs b/packages/fortifier/src/validations/email_address.rs
index dd2f63e..1035102 100644
--- a/packages/fortifier/src/validations/email_address.rs
+++ b/packages/fortifier/src/validations/email_address.rs
@@ -12,7 +12,11 @@ pub use email_address::Options as EmailAddressOptions;
 
 use crate::error_code;
 
-error_code!(EmailAddressErrorCode, "emailAddress");
+error_code!(
+    EmailAddressErrorCode,
+    EMAIL_ADDRESS_ERROR_CODE,
+    "emailAddress"
+);
 
 /// Email validation error.
 #[derive(Debug, Eq, PartialEq)]
diff --git a/packages/fortifier/src/validations/length.rs b/packages/fortifier/src/validations/length.rs
index 481279a..98a4f09 100644
--- a/packages/fortifier/src/validations/length.rs
+++ b/packages/fortifier/src/validations/length.rs
@@ -13,7 +13,7 @@ use indexmap::{IndexMap, IndexSet};
 
 use crate::error_code;
 
-error_code!(LengthErrorCode, "length");
+error_code!(LengthErrorCode, LENGTH_ERROR_CODE, "length");
 
 /// Length validation error.
 #[derive(Debug, Eq, PartialEq)]
diff --git a/packages/fortifier/src/validations/phone_number.rs b/packages/fortifier/src/validations/phone_number.rs
index a1d7592..2b5b2a3 100644
--- a/packages/fortifier/src/validations/phone_number.rs
+++ b/packages/fortifier/src/validations/phone_number.rs
@@ -12,7 +12,7 @@ use phonenumber::{ParseError, PhoneNumber};
 
 use crate::error_code;
 
-error_code!(PhoneNumberErrorCode, "phoneNumber");
+error_code!(PhoneNumberErrorCode, PHONE_NUMBER_ERROR_CODE, "phoneNumber");
 
 /// Phone number validation error.
 #[derive(Debug, Eq, PartialEq)]
diff --git a/packages/fortifier/src/validations/range.rs b/packages/fortifier/src/validations/range.rs
index 7a0abca..cf67397 100644
--- a/packages/fortifier/src/validations/range.rs
+++ b/packages/fortifier/src/validations/range.rs
@@ -8,7 +8,7 @@ use std::{
 
 use crate::error_code;
 
-error_code!(RangeErrorCode, "range");
+error_code!(RangeErrorCode, RANGE_ERROR_CODE, "range");
 
 /// Range validation error.
 #[derive(Debug, Eq, PartialEq)]
diff --git a/packages/fortifier/src/validations/regex.rs b/packages/fortifier/src/validations/regex.rs
index 7292ae4..071b3ad 100644
--- a/packages/fortifier/src/validations/regex.rs
+++ b/packages/fortifier/src/validations/regex.rs
@@ -38,7 +38,7 @@ where
     }
 }
 
-error_code!(RegexErrorCode, "regex");
+error_code!(RegexErrorCode, REGEX_ERROR_CODE, "regex");
 
 /// Regular expression validation error.
 #[derive(Debug, Eq, PartialEq)]
diff --git a/packages/fortifier/src/validations/url.rs b/packages/fortifier/src/validations/url.rs
index e89b9f8..c19739e 100644
--- a/packages/fortifier/src/validations/url.rs
+++ b/packages/fortifier/src/validations/url.rs
@@ -11,7 +11,7 @@ use url::{ParseError, Url};
 
 use crate::error_code;
 
-error_code!(UrlErrorCode, "url");
+error_code!(UrlErrorCode, URL_ERROR_CODE, "url");
 
 /// URL validation error.
 #[derive(Debug, Eq, PartialEq)]