diff --git a/mercurial/ui.py b/mercurial/ui.py
--- a/mercurial/ui.py
+++ b/mercurial/ui.py
@@ -1427,7 +1427,7 @@
 
         return i
 
-    def _readline(self):
+    def _readline(self, prompt=' '):
         # Replacing stdin/stdout temporarily is a hard problem on Python 3
         # because they have to be text streams with *no buffering*. Instead,
         # we use rawinput() only if call_readline() will be invoked by
@@ -1450,13 +1450,13 @@
         # - http://bugs.python.org/issue12833
         with self.timeblockedsection('stdio'):
             if usereadline:
-                line = encoding.strtolocal(pycompat.rawinput(r' '))
+                line = encoding.strtolocal(pycompat.rawinput(prompt))
                 # When stdin is in binary mode on Windows, it can cause
                 # raw_input() to emit an extra trailing carriage return
                 if pycompat.oslinesep == b'\r\n' and line.endswith(b'\r'):
                     line = line[:-1]
             else:
-                self._fout.write(b' ')
+                self._fout.write(pycompat.bytestr(prompt))
                 self._fout.flush()
                 line = self._fin.readline()
                 if not line:
@@ -1478,10 +1478,14 @@
             self._writemsg(self._fmsgout, default or '', "\n",
                            type='promptecho')
             return default
-        self._writemsgnobuf(self._fmsgout, msg, type='prompt', **opts)
-        self.flush()
+        if self._colormode == 'win32':
+            readline_prompt = ' '
+            self._writemsgnobuf(self._fmsgout, msg, type='prompt', **opts)
+            self.flush()
+        else:
+            readline_prompt = self.label(msg, 'ui.prompt') + ' '
         try:
-            r = self._readline()
+            r = self._readline(prompt=readline_prompt)
             if not r:
                 r = default
             if self.configbool('ui', 'promptecho'):