diff --git a/boring/src/ssl/test/extensions.rs b/boring/src/ssl/test/extensions.rs
index 7dff7d55..c9bde49f 100644
--- a/boring/src/ssl/test/extensions.rs
+++ b/boring/src/ssl/test/extensions.rs
@@ -2,9 +2,7 @@ use crate::ssl::ExtensionType;
 
 #[test]
 fn test_exntension_order_index() {
-    let mut i = 0;
-    for ext in ExtensionType::BORING_SSLEXTENSION_PERMUTATION {
+    for (i, ext) in ExtensionType::BORING_SSLEXTENSION_PERMUTATION.iter().enumerate() {
         assert_eq!(ExtensionType::index_of(*ext), Some(i));
-        i += 1;
     }
-}
+}
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