diff --git a/hgext/convert/hg.py b/hgext/convert/hg.py
--- a/hgext/convert/hg.py
+++ b/hgext/convert/hg.py
@@ -225,7 +225,7 @@ class mercurial_sink(converter_sink):
 
     def hascommit(self, rev):
         if not rev in self.repo and self.clonebranches:
-            raise util.Abort(_('revision %s not be found in destination '
+            raise util.Abort(_('revision %s not found in destination '
                                'repository (lookups with clonebranches=true '
                                'are not implemented)') % rev)
         return rev in self.repo
diff --git a/hgext/convert/subversion.py b/hgext/convert/subversion.py
--- a/hgext/convert/subversion.py
+++ b/hgext/convert/subversion.py
@@ -1194,5 +1194,5 @@ class svn_sink(converter_sink, commandli
         if rev in self.childmap:
             return True
         raise util.Abort(_('splice map revision %s not found in subversion '
-                           'child map (revision lookups are not implemented')
+                           'child map (revision lookups are not implemented)')
                          % rev)
diff --git a/tests/test-convert-splicemap.t b/tests/test-convert-splicemap.t
--- a/tests/test-convert-splicemap.t
+++ b/tests/test-convert-splicemap.t
@@ -203,7 +203,7 @@ Test clonebranches
   >   --splicemap splicemap ordered ordered-hg3
   initializing destination ordered-hg3 repository
   scanning source...
-  abort: revision 717d54d67e6c31fd75ffef2ff3042bdd98418437 not be found in destination repository (lookups with clonebranches=true are not implemented)
+  abort: revision 717d54d67e6c31fd75ffef2ff3042bdd98418437 not found in destination repository (lookups with clonebranches=true are not implemented)
   [255]
 
 Test invalid dependency