diff --git a/src/server_name.rs b/src/server_name.rs
index b038daf..64dec3c 100644
--- a/src/server_name.rs
+++ b/src/server_name.rs
@@ -330,9 +330,9 @@ const fn validate(input: &[u8]) -> Result<(), InvalidDnsNameError> {
         return Err(InvalidDnsNameError);
     }
 
-    let mut character_index = 0;
-    while character_index < input.len() {
-        let ch = input[character_index];
+    let mut idx = 0;
+    while idx < input.len() {
+        let ch = input[idx];
         state = match (state, ch) {
             (Start | Next | NextAfterNumericOnly | Hyphen { .. }, b'.') => {
                 return Err(InvalidDnsNameError)
@@ -358,7 +358,7 @@ const fn validate(input: &[u8]) -> Result<(), InvalidDnsNameError> {
             ) => Subsequent { len: len + 1 },
             _ => return Err(InvalidDnsNameError),
         };
-        character_index += 1;
+        idx += 1;
     }
 
     if matches!(