diff --git a/hgext/color.py b/hgext/color.py
--- a/hgext/color.py
+++ b/hgext/color.py
@@ -308,8 +308,7 @@ class colorui(uimod.ui):
             else:
                 self._buffers[-1].extend(args)
         elif self._colormode == 'win32':
-            for a in args:
-                color.win32print(a, super(colorui, self).write, **opts)
+            color.win32print(super(colorui, self).write, *args, **opts)
         else:
             return super(colorui, self).write(
                 *[self.label(a, label) for a in args], **opts)
@@ -322,8 +321,7 @@ class colorui(uimod.ui):
         if self._bufferstates and self._bufferstates[-1][0]:
             return self.write(*args, **opts)
         if self._colormode == 'win32':
-            for a in args:
-                color.win32print(a, super(colorui, self).write_err, **opts)
+            color.win32print(super(colorui, self).write_err, *args, **opts)
         else:
             return super(colorui, self).write_err(
                 *[self.label(a, label) for a in args], **opts)
diff --git a/mercurial/color.py b/mercurial/color.py
--- a/mercurial/color.py
+++ b/mercurial/color.py
@@ -288,7 +288,11 @@ if pycompat.osname == 'nt':
             ansire = re.compile('\033\[([^m]*)m([^\033]*)(.*)',
                                 re.MULTILINE | re.DOTALL)
 
-    def win32print(text, writefunc, **opts):
+    def win32print(writefunc, *msgs, **opts):
+        for text in msgs:
+            _win32print(text, writefunc, **opts)
+
+    def _win32print(text, writefunc, **opts):
         label = opts.get('label', '')
         attr = origattr