diff --git a/crates/irtt-server/src/fill.rs b/crates/irtt-server/src/fill.rs
index 82f89a7..0103894 100644
--- a/crates/irtt-server/src/fill.rs
+++ b/crates/irtt-server/src/fill.rs
@@ -115,7 +115,9 @@ fn parse_hex_pattern(body: &str) -> Option<Vec<u8>> {
         return None;
     }
     digits
-        .chunks_exact(2)
+        .as_chunks::<2>()
+        .0
+        .iter()
         .map(|pair| Some(hex_digit(pair[0])? << 4 | hex_digit(pair[1])?))
         .collect()
 }