diff --git a/hgext/remotefilelog/debugcommands.py b/hgext/remotefilelog/debugcommands.py
--- a/hgext/remotefilelog/debugcommands.py
+++ b/hgext/remotefilelog/debugcommands.py
@@ -16,6 +16,7 @@
     error,
     filelog,
     node as nodemod,
+    pycompat,
     revlog,
 )
 from . import (
@@ -276,11 +277,11 @@
                 totalblobsize += blobsize
             else:
                 blobsize = "(missing)"
-            ui.write("%s  %s  %s%d\n" % (
+            ui.write("%s  %s  %s%s\n" % (
                 hashformatter(node),
                 hashformatter(deltabase),
                 ('%d' % deltalen).ljust(14),
-                blobsize))
+                pycompat.bytestr(blobsize)))
 
         if filename is not None:
             printtotals()