diff --git a/crates/util/src/lib.rs b/crates/util/src/lib.rs
index 952693a17..c8f30b14e 100644
--- a/crates/util/src/lib.rs
+++ b/crates/util/src/lib.rs
@@ -234,29 +234,6 @@ fn wcsfilecmp_leading_digits(a: &wstr, b: &wstr) -> (Ordering, usize, usize) {
     (ret, ai, bi)
 }
 
-/// Finds `needle` in a `haystack` and returns the index of the first matching element, if any.
-///
-/// # Examples
-///
-/// ```
-/// use fish_util::find_subslice;
-/// let haystack = b"ABC ABCDAB ABCDABCDABDE";
-///
-/// assert_eq!(find_subslice(b"ABCDABD", haystack), Some(15));
-/// assert_eq!(find_subslice(b"ABCDE", haystack), None);
-/// ```
-pub fn find_subslice<T: PartialEq>(
-    needle: impl AsRef<[T]>,
-    haystack: impl AsRef<[T]>,
-) -> Option<usize> {
-    let needle = needle.as_ref();
-    if needle.is_empty() {
-        return Some(0);
-    }
-    let haystack = haystack.as_ref();
-    haystack.windows(needle.len()).position(|w| w == needle)
-}
-
 #[cfg(test)]
 mod tests {
     use super::wcsfilecmp;
diff --git a/crates/widestring/src/lib.rs b/crates/widestring/src/lib.rs
index 629705833..8f010c13a 100644
--- a/crates/widestring/src/lib.rs
+++ b/crates/widestring/src/lib.rs
@@ -60,11 +60,27 @@ pub const fn char_offset(base: char, offset: u32) -> char {
     }
 }
 
-pub fn subslice_position<T: Eq>(a: &[T], b: &[T]) -> Option<usize> {
-    if b.is_empty() {
+/// Finds `needle` in a `haystack` and returns the index of the first matching element, if any.
+///
+/// # Examples
+///
+/// ```
+/// use fish_widestring::subslice_position;
+/// let haystack = b"ABC ABCDAB ABCDABCDABDE";
+///
+/// assert_eq!(subslice_position(haystack, b"ABCDABD"), Some(15));
+/// assert_eq!(subslice_position(haystack, b"ABCDE"), None);
+/// ```
+pub fn subslice_position<T: PartialEq>(
+    haystack: impl AsRef<[T]>,
+    needle: impl AsRef<[T]>,
+) -> Option<usize> {
+    let needle = needle.as_ref();
+    if needle.is_empty() {
         return Some(0);
     }
-    a.windows(b.len()).position(|aw| aw == b)
+    let haystack = haystack.as_ref();
+    haystack.windows(needle.len()).position(|w| w == needle)
 }
 
 /// Helpers to convert things to widestring.
diff --git a/src/history/history.rs b/src/history/history.rs
index 05e700a99..957f926bb 100644
--- a/src/history/history.rs
+++ b/src/history/history.rs
@@ -24,6 +24,7 @@
     threads::ThreadPool,
 };
 use fish_wcstringutil::{subsequence_in_string, trim};
+use fish_widestring::subslice_position;
 use std::{
     borrow::Cow,
     collections::{BTreeMap, HashMap, HashSet},
@@ -64,7 +65,6 @@
     wildcard::{ANY_STRING, wildcard_match},
     wutil::{FileId, INVALID_FILE_ID, file_id_for_file, wrealpath, wstat, wunlink},
 };
-use fish_util::find_subslice;
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub enum SearchType {
@@ -218,7 +218,7 @@ pub fn matches_search(&self, term: &wstr, typ: SearchType, case_sensitive: bool)
         match typ {
             SearchType::Exact => term == *content_to_match,
             SearchType::Contains => {
-                find_subslice(term.as_slice(), content_to_match.as_slice()).is_some()
+                subslice_position(content_to_match.as_slice(), term.as_slice()).is_some()
             }
             SearchType::Prefix => content_to_match.as_slice().starts_with(term.as_slice()),
             SearchType::LinePrefix => content_to_match
@@ -1174,7 +1174,7 @@ fn should_import_bash_history_line(line: &wstr) -> bool {
     // Skip lines with [[...]] and ((...)) since we don't handle those constructs.
     // "<<" here is a proxy for heredocs (and herestrings).
     for seq in [L!("[["), L!("]]"), L!("(("), L!("))"), L!("<<")] {
-        if find_subslice(seq, line.as_char_slice()).is_some() {
+        if subslice_position(line.as_char_slice(), seq).is_some() {
             return false;
         }
     }