diff --git a/library/std/src/path/tests.rs b/library/std/src/path/tests.rs
index ff94fda5a227b..896d6c2a64c60 100644
--- a/library/std/src/path/tests.rs
+++ b/library/std/src/path/tests.rs
@@ -873,12 +873,12 @@ pub fn test_decompositions_windows() {
     );
 
     t!("\\\\.\\foo/bar",
-    iter: ["\\\\.\\foo/bar", "\\"],
+    iter: ["\\\\.\\foo", "\\", "bar"],
     has_root: true,
     is_absolute: true,
-    parent: None,
-    file_name: None,
-    file_stem: None,
+    parent: Some("\\\\.\\foo/"),
+    file_name: Some("bar"),
+    file_stem: Some("bar"),
     extension: None
     );
 
diff --git a/library/std/src/sys/windows/path.rs b/library/std/src/sys/windows/path.rs
index dda3ed68cfc95..05b16eea45fbf 100644
--- a/library/std/src/sys/windows/path.rs
+++ b/library/std/src/sys/windows/path.rs
@@ -62,7 +62,8 @@ pub fn parse_prefix(path: &OsStr) -> Option<Prefix<'_>> {
                     }
                     // \\?\cat_pics
                     _ => {
-                        let idx = path.iter().position(|&b| b == b'\\').unwrap_or(path.len());
+                        let idx =
+                            path.iter().position(|&b| is_verbatim_sep(b)).unwrap_or(path.len());
                         let slice = &path[..idx];
                         return Some(Verbatim(unsafe { u8_slice_as_os_str(slice) }));
                     }
@@ -70,7 +71,7 @@ pub fn parse_prefix(path: &OsStr) -> Option<Prefix<'_>> {
             }
         } else if let Some(path) = path.strip_prefix(b".\\") {
             // \\.\COM42
-            let idx = path.iter().position(|&b| b == b'\\').unwrap_or(path.len());
+            let idx = path.iter().position(|&b| is_sep_byte(b)).unwrap_or(path.len());
             let slice = &path[..idx];
             return Some(DeviceNS(unsafe { u8_slice_as_os_str(slice) }));
         }