diff --git a/mercurial/cmdutil.py b/mercurial/cmdutil.py
--- a/mercurial/cmdutil.py
+++ b/mercurial/cmdutil.py
@@ -1135,6 +1135,7 @@
     dryrun = opts.get("dry_run")
     wctx = repo[None]
 
+    uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
     def walkpat(pat):
         srcs = []
         if after:
@@ -1144,7 +1145,7 @@
         m = scmutil.match(wctx, [pat], opts, globbed=True)
         for abs in wctx.walk(m):
             state = repo.dirstate[abs]
-            rel = m.rel(abs)
+            rel = uipathfn(abs)
             exact = m.exact(abs)
             if state in badstates:
                 if exact and state == '?':
@@ -2188,7 +2189,7 @@
                     ret = 0
             except error.LookupError:
                 ui.status(_("skipping missing subrepository: %s\n")
-                               % m.rel(subpath))
+                               % uipathfn(subpath))
 
     return ret
 
@@ -2819,7 +2820,7 @@
                 for f in names:
                     if f.startswith(path_):
                         return
-                ui.warn("%s: %s\n" % (m.rel(path), msg))
+                ui.warn("%s: %s\n" % (uipathfn(path), msg))
 
             for abs in ctx.walk(matchmod.badmatch(m, badfn)):
                 if abs not in names:
diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -51,8 +51,10 @@
 )
 
 if pycompat.iswindows:
+    from . import windows as platform
     from . import scmwindows as scmplatform
 else:
+    from . import posix as platform
     from . import scmposix as scmplatform
 
 parsers = policy.importmod(r'parsers')
@@ -757,7 +759,7 @@
         pathto = repo.pathto
         return lambda f: pathto(f, cwd)
     else:
-        return lambda f: f
+        return platform.localpath
 
 def subdiruipathfn(subpath, uipathfn):
     '''Create a new uipathfn that treats the file as relative to subpath.'''
diff --git a/tests/test-copy.t b/tests/test-copy.t
--- a/tests/test-copy.t
+++ b/tests/test-copy.t
@@ -118,6 +118,23 @@
   [255]
   $ hg st -A
   ? foo
+respects ui.relative-paths
+  $ mkdir dir
+  $ cd dir
+  $ hg mv ../foo ../bar
+  ../foo: not copying - file is not managed
+  abort: no files to copy
+  [255]
+  $ hg mv ../foo ../bar --config ui.relative-paths=yes
+  ../foo: not copying - file is not managed
+  abort: no files to copy
+  [255]
+  $ hg mv ../foo ../bar --config ui.relative-paths=no
+  foo: not copying - file is not managed
+  abort: no files to copy
+  [255]
+  $ cd ..
+  $ rmdir dir
   $ hg add foo
 dry-run; print a warning that this is not a real copy; foo is added
   $ hg mv --dry-run foo bar