diff --git a/mercurial/dispatch.py b/mercurial/dispatch.py
--- a/mercurial/dispatch.py
+++ b/mercurial/dispatch.py
@@ -111,7 +111,7 @@ def _runcatch(ui, args):
             ui.warn(_("abort: %s: %s\n") % (inst.strerror, inst.filename))
         else:
             ui.warn(_("abort: %s\n") % inst.strerror)
-    except util.UnexpectedOutput, inst:
+    except error.ResponseError, inst:
         ui.warn(_("abort: %s") % inst.args[0])
         if not isinstance(inst.args[1], basestring):
             ui.warn(" %r\n" % (inst.args[1],))
diff --git a/mercurial/error.py b/mercurial/error.py
--- a/mercurial/error.py
+++ b/mercurial/error.py
@@ -46,3 +46,7 @@ class LockHeld(LockError):
 
 class LockUnavailable(LockError):
     pass
+
+class ResponseError(Exception):
+    """Raised to print an error with part of output and exit."""
+
diff --git a/mercurial/httprepo.py b/mercurial/httprepo.py
--- a/mercurial/httprepo.py
+++ b/mercurial/httprepo.py
@@ -135,7 +135,7 @@ class httprepository(repo.repository):
         try:
             return map(bin, d[:-1].split(" "))
         except:
-            raise util.UnexpectedOutput(_("unexpected response:"), d)
+            raise error.ResponseError(_("unexpected response:"), d)
 
     def branches(self, nodes):
         n = " ".join(map(hex, nodes))
@@ -144,7 +144,7 @@ class httprepository(repo.repository):
             br = [ tuple(map(bin, b.split(" "))) for b in d.splitlines() ]
             return br
         except:
-            raise util.UnexpectedOutput(_("unexpected response:"), d)
+            raise error.ResponseError(_("unexpected response:"), d)
 
     def between(self, pairs):
         batch = 8 # avoid giant requests
@@ -155,7 +155,7 @@ class httprepository(repo.repository):
             try:
                 r += [ l and map(bin, l.split(" ")) or [] for l in d.splitlines() ]
             except:
-                raise util.UnexpectedOutput(_("unexpected response:"), d)
+                raise error.ResponseError(_("unexpected response:"), d)
         return r
 
     def changegroup(self, nodes, kind):
@@ -200,7 +200,7 @@ class httprepository(repo.repository):
                 try:
                     ret = int(resp_code)
                 except ValueError, err:
-                    raise util.UnexpectedOutput(
+                    raise error.ResponseError(
                             _('push failed (unexpected response):'), resp)
                 self.ui.write(output)
                 return ret
diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -2076,7 +2076,7 @@ class localrepository(repo.repository):
         try:
             resp = int(l)
         except ValueError:
-            raise util.UnexpectedOutput(
+            raise error.ResponseError(
                 _('Unexpected response from remote server:'), l)
         if resp == 1:
             raise util.Abort(_('operation forbidden by server'))
@@ -2089,7 +2089,7 @@ class localrepository(repo.repository):
         try:
             total_files, total_bytes = map(int, l.split(' ', 1))
         except (ValueError, TypeError):
-            raise util.UnexpectedOutput(
+            raise error.ResponseError(
                 _('Unexpected response from remote server:'), l)
         self.ui.status(_('%d files to transfer, %s of data\n') %
                        (total_files, util.bytecount(total_bytes)))
@@ -2101,7 +2101,7 @@ class localrepository(repo.repository):
                 name, size = l.split('\0', 1)
                 size = int(size)
             except (ValueError, TypeError):
-                raise util.UnexpectedOutput(
+                raise error.ResponseError(
                     _('Unexpected response from remote server:'), l)
             self.ui.debug(_('adding %s (%s)\n') % (name, util.bytecount(size)))
             ofp = self.sopener(name, 'w')
diff --git a/mercurial/sshrepo.py b/mercurial/sshrepo.py
--- a/mercurial/sshrepo.py
+++ b/mercurial/sshrepo.py
@@ -132,7 +132,7 @@ class sshrepository(repo.repository):
         try:
             l = int(l)
         except:
-            self.raise_(util.UnexpectedOutput(_("unexpected response:"), l))
+            self.raise_(error.ResponseError(_("unexpected response:"), l))
         return self.pipei.read(l)
 
     def _send(self, data, flush=False):
@@ -164,7 +164,7 @@ class sshrepository(repo.repository):
         try:
             return map(bin, d[:-1].split(" "))
         except:
-            self.raise_(util.UnexpectedOutput(_("unexpected response:"), d))
+            self.raise_(error.ResponseError(_("unexpected response:"), d))
 
     def branches(self, nodes):
         n = " ".join(map(hex, nodes))
@@ -173,7 +173,7 @@ class sshrepository(repo.repository):
             br = [ tuple(map(bin, b.split(" "))) for b in d.splitlines() ]
             return br
         except:
-            self.raise_(util.UnexpectedOutput(_("unexpected response:"), d))
+            self.raise_(error.ResponseError(_("unexpected response:"), d))
 
     def between(self, pairs):
         n = " ".join(["-".join(map(hex, p)) for p in pairs])
@@ -182,7 +182,7 @@ class sshrepository(repo.repository):
             p = [ l and map(bin, l.split(" ")) or [] for l in d.splitlines() ]
             return p
         except:
-            self.raise_(util.UnexpectedOutput(_("unexpected response:"), d))
+            self.raise_(error.ResponseError(_("unexpected response:"), d))
 
     def changegroup(self, nodes, kind):
         n = " ".join(map(hex, nodes))
@@ -217,7 +217,7 @@ class sshrepository(repo.repository):
         try:
             return int(r)
         except:
-            self.raise_(util.UnexpectedOutput(_("unexpected response:"), r))
+            self.raise_(error.ResponseError(_("unexpected response:"), r))
 
     def addchangegroup(self, cg, source, url):
         d = self.call("addchangegroup")
@@ -239,7 +239,7 @@ class sshrepository(repo.repository):
         try:
             return int(r)
         except:
-            self.raise_(util.UnexpectedOutput(_("unexpected response:"), r))
+            self.raise_(error.ResponseError(_("unexpected response:"), r))
 
     def stream_out(self):
         return self.do_cmd('stream_out')
diff --git a/mercurial/util.py b/mercurial/util.py
--- a/mercurial/util.py
+++ b/mercurial/util.py
@@ -335,9 +335,6 @@ def increasingchunks(source, min=1024, m
 class Abort(Exception):
     """Raised if a command needs to print an error and exit."""
 
-class UnexpectedOutput(Abort):
-    """Raised to print an error with part of output and exit."""
-
 def always(fn): return True
 def never(fn): return False