diff --git a/debian/changelog b/debian/changelog
index 0b8ea68..caacbef 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -10,6 +10,7 @@ ubuntu-dev-tools (0.120) UNRELEASED; urgency=low
     the latest version in a release.
   * pull-{lp,debian}-source, pull-debian-debdiff: Catch KeyboardInterrupt.
     (LP: #713845)
+  * pull-debian-source: Handle -p-u and -security suites.
 
   [ Julian Taylor ]
   * add support for cowbuilder and cowbuilder-dist in builder.py
diff --git a/pull-debian-source b/pull-debian-source
index b4e4314..df52d03 100755
--- a/pull-debian-source
+++ b/pull-debian-source
@@ -24,6 +24,27 @@ from ubuntutools.config import UDTConfig
 from ubuntutools.distro_info import DebianDistroInfo
 from ubuntutools.logger import Logger
 
+def is_suite(version):
+    """If version could be considered to be a Debian suite, return the
+    canonical suite name. Otherwise None
+    """
+    debian_info = DebianDistroInfo()
+    debian_releases = debian_info.all + ['experimental']
+
+    if '-' in version:
+        release, pocket = version.split('-', 1)
+        release = debian_info.codename(release, default=release)
+        if release in debian_releases:
+            if pocket in ('proposed-updates', 'p-u'):
+                return (release + '-proposed-updates')
+            elif pocket == 'security':
+                return (release + '-security')
+    else:
+        release = debian_info.codename(version, default=version)
+        if release in debian_releases:
+            return release
+    return None
+
 def main():
     usage = 'Usage: %prog <package> [release|version]'
     parser = optparse.OptionParser(usage)
@@ -59,9 +80,8 @@ def main():
     version = args[1] if len(args) > 1 else 'unstable'
     component = None
 
-    debian_info = DebianDistroInfo()
-    if debian_info.codename(version, default=version) in debian_info.all:
-        suite = debian_info.codename(version, default=version)
+    suite = is_suite(version)
+    if suite is not None:
         line = list(rmadison('debian', package, suite, 'source'))
         if not line:
             Logger.error('Unable to find %s in Debian suite "%s".', package,
diff --git a/ubuntutools/archive.py b/ubuntutools/archive.py
index 6b95b21..47ad0fb 100644
--- a/ubuntutools/archive.py
+++ b/ubuntutools/archive.py
@@ -520,6 +520,10 @@ def rmadison(url, package, suite=None, arch=None):
                                stderr=subprocess.PIPE, close_fds=True)
     output = process.communicate()[0]
     assert process.wait() == 0
+
+    # rmadison uses some shorthand
+    suite = suite.replace('-proposed-updates', '-p-u')
+
     for line in output.strip().splitlines():
         pkg, ver, dist, archs = [x.strip() for x in line.split('|')]
         comp = 'main'