diff --git a/lib/v3/CHANGELOG.md b/lib/v3/CHANGELOG.md
index 39832f3..91311f5 100644
--- a/lib/v3/CHANGELOG.md
+++ b/lib/v3/CHANGELOG.md
@@ -4,6 +4,7 @@
 
 ### Patch
 
+- Use `iter().enumerate()` when possible
 - Encode by the greatest multiple of blocks that fits 128 bits
 - Use `doc_cfg` instead of `doc_auto_cfg`
 
diff --git a/lib/v3/src/lib.rs b/lib/v3/src/lib.rs
index d876786..ea2117f 100644
--- a/lib/v3/src/lib.rs
+++ b/lib/v3/src/lib.rs
@@ -344,8 +344,8 @@ fn decode_block<Bit: BitWidth, Msb: Bool>(
     let bit = Bit::VAL;
     let msb = Msb::VAL;
     let mut x = 0u64;
-    for j in 0 .. input.len() {
-        let y = values[input[j] as usize];
+    for (j, input) in input.iter().enumerate() {
+        let y = values[*input as usize];
         check!(j, y < 1 << bit);
         x |= u64::from(y) << (bit * order(msb, dec(bit), j));
     }