diff --git a/src/compare/util.rs b/src/compare/util.rs
index 903b26c8..0a8b424b 100644
--- a/src/compare/util.rs
+++ b/src/compare/util.rs
@@ -29,7 +29,7 @@ fn is_slice_of(parent: &str, child: &str) -> bool {
 /// Get the byte offset into source that the rust object exists at.
 ///
 /// These offsets are zero-based unlike the elisp ones.
-fn get_rust_byte_offsets<'b, 's>(original_document: &'s str, subset: &'b str) -> (usize, usize) {
+fn get_rust_byte_offsets(original_document: &str, subset: &str) -> (usize, usize) {
     debug_assert!(is_slice_of(original_document, subset));
     let offset = subset.as_ptr() as usize - original_document.as_ptr() as usize;
     let end = offset + subset.len();