diff --git a/crates/squozen/bench/bench_patprep.rs b/crates/squozen/bench/bench_patprep.rs
index c4fd1f2..4e09fd0 100644
--- a/crates/squozen/bench/bench_patprep.rs
+++ b/crates/squozen/bench/bench_patprep.rs
@@ -1,11 +1,13 @@
-use squozen::prepare_pattern::prepare_pattern;
+use squozen::prepare_pattern::prepare_pattern_raw;
 
 const COUNT: usize = 5 * 1000 * 1000 * 100;
 
 fn main() {
     let mut end = COUNT;
+    let mut dest = Vec::<u8>::with_capacity(100);
     while end > 0 {
-        let _g = prepare_pattern(b"/foo/bar/whatever[0-9]*");
+        dest.clear();
+        prepare_pattern_raw(b"/foo/bar/whatever[0-9]*", &mut dest);
         end = end - 1;
     }
 }
diff --git a/crates/squozen/src/prepare_pattern.rs b/crates/squozen/src/prepare_pattern.rs
index 77d021d..e8a0188 100644
--- a/crates/squozen/src/prepare_pattern.rs
+++ b/crates/squozen/src/prepare_pattern.rs
@@ -34,7 +34,7 @@ pub fn prepare_pattern(name: &[u8]) -> Vec<u8> {
 }
 
 pub fn prepare_pattern_raw(name: &[u8], dest: &mut Vec<u8>) {
-    let mut eol = name.len();
+    let eol = name.len();
     if eol == 0 {
         panic!("Library error - This function should never be called with an empty string.")
     }
@@ -42,7 +42,7 @@ pub fn prepare_pattern_raw(name: &[u8], dest: &mut Vec<u8>) {
     // After this point, eol always points to the index from where we want to
     // stop, not to the character beyond that.
 
-    eol = hunt(name, eol - 1, 0, |&c| c != b'*' && c != b'?');
+    let mut eol = hunt(name, eol - 1, 0, |&c| c != b'*' && c != b'?');
     if name[eol] == b']' {
         eol = hunt(&name, eol - 1, 0, |&c| c == b'[');
         eol = if eol > 0 { eol - 1 } else { 0 }