diff --git a/hgext/phabricator.py b/hgext/phabricator.py
--- a/hgext/phabricator.py
+++ b/hgext/phabricator.py
@@ -441,7 +441,7 @@
                 )
                 unfi.ui.warn(
                     _(
-                        b'D%s: local tag removed - does not match '
+                        b'D%d: local tag removed - does not match '
                         b'Differential history\n'
                     )
                     % drev
@@ -1168,7 +1168,7 @@
                         writediffproperties(unfi[newnode], diffmap[old.node()])
                     except util.urlerr.urlerror:
                         ui.warnnoi18n(
-                            b'Failed to update metadata for D%s\n' % drevid
+                            b'Failed to update metadata for D%d\n' % drevid
                         )
                 # Remove local tags since it's no longer necessary
                 tagname = b'D%d' % drevid
@@ -1208,7 +1208,7 @@
         desc = ctx.description().splitlines()[0]
         oldnode, olddiff, drevid = oldmap.get(ctx.node(), (None, None, None))
         if drevid:
-            drevdesc = ui.label(b'D%s' % drevid, b'phabricator.drev')
+            drevdesc = ui.label(b'D%d' % drevid, b'phabricator.drev')
         else:
             drevdesc = ui.label(_(b'NEW'), b'phabricator.drev')