diff --git a/library/std/src/sys/windows/mod.rs b/library/std/src/sys/windows/mod.rs
index 14e34ffec4d2e..9c83d6eb8bf68 100644
--- a/library/std/src/sys/windows/mod.rs
+++ b/library/std/src/sys/windows/mod.rs
@@ -150,7 +150,7 @@ pub fn decode_error_kind(errno: i32) -> ErrorKind {
 
 pub fn unrolled_find_u16s(needle: u16, haystack: &[u16]) -> Option<usize> {
     let ptr = haystack.as_ptr();
-    let mut start = &haystack[..];
+    let mut start = haystack;
 
     // For performance reasons unfold the loop eight times.
     while start.len() >= 8 {