diff --git a/rust/hg-core/src/revlog/nodemap_docket.rs b/rust/hg-core/src/revlog/nodemap_docket.rs
--- a/rust/hg-core/src/revlog/nodemap_docket.rs
+++ b/rust/hg-core/src/revlog/nodemap_docket.rs
@@ -3,7 +3,6 @@ use bytes_cast::{unaligned, BytesCast};
 use memmap2::Mmap;
 use std::path::{Path, PathBuf};
 
-use crate::utils::strip_suffix;
 use crate::vfs::Vfs;
 
 const ONDISK_VERSION: u8 = 1;
@@ -97,8 +96,9 @@ fn rawdata_path(docket_path: &Path, uid:
         .expect("expected a base name")
         .to_str()
         .expect("expected an ASCII file name in the store");
-    let prefix = strip_suffix(docket_name, ".n.a")
-        .or_else(|| strip_suffix(docket_name, ".n"))
+    let prefix = docket_name
+        .strip_suffix(".n.a")
+        .or_else(|| docket_name.strip_suffix(".n"))
         .expect("expected docket path in .n or .n.a");
     let name = format!("{}-{}.nd", prefix, uid);
     docket_path
diff --git a/rust/hg-core/src/utils.rs b/rust/hg-core/src/utils.rs
--- a/rust/hg-core/src/utils.rs
+++ b/rust/hg-core/src/utils.rs
@@ -196,15 +196,6 @@ impl<'a> Escaped for &'a HgPath {
     }
 }
 
-// TODO: use the str method when we require Rust 1.45
-pub(crate) fn strip_suffix<'a>(s: &'a str, suffix: &str) -> Option<&'a str> {
-    if s.ends_with(suffix) {
-        Some(&s[..s.len() - suffix.len()])
-    } else {
-        None
-    }
-}
-
 #[cfg(unix)]
 pub fn shell_quote(value: &[u8]) -> Vec<u8> {
     // TODO: Use the `matches!` macro when we require Rust 1.42+