diff --git a/backportpackage b/backportpackage
index 45fc0cc..f6261ec 100755
--- a/backportpackage
+++ b/backportpackage
@@ -291,7 +291,9 @@ def orig_needed(upload, workdir, pkg):
                % (user, ppa, filename))
         try:
             headers, body = h.request(url, 'HEAD')
-            if headers.status != 200:
+            if (headers.status != 200 or 
+                not headers['content-location'].
+                    startswith('https://launchpadlibrarian.net')):
                 return True
         except HttpLib2Error, e:
             Logger.info(e)
diff --git a/debian/changelog b/debian/changelog
index 93a51aa..d54726a 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -10,7 +10,12 @@ ubuntu-dev-tools (0.149) UNRELEASED; urgency=low
   [ Adam Gandelman ]
   * backportpackage: Fix destination for --dont-sign option. (LP: #1183985)
 
- -- Adam Gandelman <adamg@ubuntu.com>  Fri, 24 May 2013 12:56:08 -0700
+  [ Evan Broder ]
+  * Only conclude that we don't need an orig tarball if we're sent to the
+    librarian (as opposed to the login page from a private PPA).
+    (LP: #1106429)
+
+ -- Evan Broder <evan@stripe.com>  Tue, 09 Jul 2013 17:49:21 -0700
 
 ubuntu-dev-tools (0.148) unstable; urgency=low