diff --git a/src/parallel/mod.rs b/src/parallel/mod.rs
index d69146dc5..019eae102 100644
--- a/src/parallel/mod.rs
+++ b/src/parallel/mod.rs
@@ -1,20 +1,3 @@
 pub(crate) mod async_executor;
 pub(crate) mod job_token;
 pub(crate) mod stderr;
-
-/// Remove all element in `vec` which `f(element)` returns `false`.
-///
-/// TODO: Remove this once the MSRV is bumped to v1.61
-pub(crate) fn retain_unordered_mut<T, F>(vec: &mut Vec<T>, mut f: F)
-where
-    F: FnMut(&mut T) -> bool,
-{
-    let mut i = 0;
-    while i < vec.len() {
-        if f(&mut vec[i]) {
-            i += 1;
-        } else {
-            vec.swap_remove(i);
-        }
-    }
-}