diff --git a/britney.py b/britney.py
index b7b6074..26de12a 100755
--- a/britney.py
+++ b/britney.py
@@ -295,6 +295,7 @@ class Britney(object):
         self.suite_info = None  # Initialized during __parse_arguments
         self.__parse_arguments()
         MigrationItem.set_architectures(self.options.architectures)
+        MigrationItem.set_suites(self.suite_info)
 
         # initialize the apt_pkg back-end
         apt_pkg.init()
@@ -1776,7 +1777,7 @@ class Britney(object):
         * "source_name" is the name of the source package, whose
           binaries are migrating.
         * "suite" is the suite from which the binaries are migrating.
-          [Same as item.suite, where available]
+          [Same as item.suite.name, where available]
         * "migration_architecture" is the architecture determines
           architecture of the migrating binaries (can be "source" for
           a "source"-migration, meaning all binaries regardless of
@@ -1976,7 +1977,7 @@ class Britney(object):
         eqv_set = set()
 
         updates, rms, _ = self._compute_groups(item.package,
-                                               item.suite,
+                                               item.suite.name,
                                                item.architecture,
                                                item.is_removal,
                                                removals=removals)
@@ -1993,7 +1994,7 @@ class Britney(object):
 
             # add/update the source package
             if not item.is_removal:
-                sources['testing'][item.package] = sources[item.suite][item.package]
+                sources['testing'][item.package] = sources[item.suite.name][item.package]
 
         # If we are removing *and* updating packages, then check for eqv. packages
         if rms and updates:
@@ -2041,7 +2042,7 @@ class Britney(object):
 
         # Add/Update binary packages in testing
         if updates:
-            packages_s = self.binaries[item.suite]
+            packages_s = self.binaries[item.suite.name]
 
             for updated_pkg_id in updates:
                 binary, new_version, parch = updated_pkg_id
@@ -2132,7 +2133,7 @@ class Britney(object):
             affected_pos = set()
             affected_remain = set()
             for item in actions:
-                _, rms, _ = self._compute_groups(item.package, item.suite,
+                _, rms, _ = self._compute_groups(item.package, item.suite.name,
                                                  item.architecture,
                                                  item.is_removal,
                                                  allow_smooth_updates=False)
@@ -2213,7 +2214,7 @@ class Britney(object):
         output_logger = self.output_logger
 
         for y in sorted((y for y in packages), key=attrgetter('uvname')):
-            updates, rms, _ = self._compute_groups(y.package, y.suite, y.architecture, y.is_removal)
+            updates, rms, _ = self._compute_groups(y.package, y.suite.name, y.architecture, y.is_removal)
             result = (y, frozenset(updates), frozenset(rms))
             group_info[y] = result
 
@@ -2664,22 +2665,23 @@ class Britney(object):
             if pkg.is_removal:
                 continue
 
+            suite_name = pkg.suite.name
             inunstable = pkg.package in self.sources['unstable']
             rightversion = inunstable and (apt_pkg.version_compare(self.sources['unstable'][pkg.package].version, pkg.version) == 0)
-            if pkg.suite == 'unstable' and not rightversion:
+            if suite_name == 'unstable' and not rightversion:
                 for suite in ['pu', 'tpu']:
-                    if suite not in self.suite_info:
+                    if suite_name not in self.suite_info:
                         continue
-                    if pkg.package in self.sources[suite] and apt_pkg.version_compare(self.sources[suite][pkg.package].version, pkg.version) == 0:
-                        pkg.suite = suite
+                    if pkg.package in self.sources[suite_name] and apt_pkg.version_compare(self.sources[suite_name][pkg.package].version, pkg.version) == 0:
+                        pkg.suite = self.suite_info[suite]
                         _pkgvers[idx] = pkg
                         break
 
             # handle *-proposed-updates
-            if pkg.suite in ['pu', 'tpu']:
-                if pkg.suite not in self.suite_info or pkg.package not in self.sources[pkg.suite]:
+            if suite_name in ['pu', 'tpu']:
+                if suite_name not in self.suite_info or pkg.package not in self.sources[suite_name]:
                     continue
-                if apt_pkg.version_compare(self.sources[pkg.suite][pkg.package].version, pkg.version) != 0:
+                if apt_pkg.version_compare(self.sources[suite_name][pkg.package].version, pkg.version) != 0:
                     issues.append("Version mismatch, %s %s != %s" % (pkg.package, pkg.version,
                                                                      self.sources[pkg.suite][pkg.package].version))
             # does the package exist in unstable?
diff --git a/britney2/migrationitem.py b/britney2/migrationitem.py
index bdf64a7..1122852 100644
--- a/britney2/migrationitem.py
+++ b/britney2/migrationitem.py
@@ -12,18 +12,28 @@
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 
+
 class MigrationItem(object):
     _architectures = []
+    _suites = None
 
     @classmethod
-    def set_architectures(cls, architectures = None):
+    def set_architectures(cls, architectures=None):
         cls._architectures = architectures or []
 
     @classmethod
     def get_architectures(cls):
         return cls._architectures
 
-    def __init__(self, name = None, versionned = True):
+    @classmethod
+    def set_suites(cls, suites):
+        cls._suites = suites
+
+    @classmethod
+    def get_suites(cls):
+        return cls._suites
+
+    def __init__(self, name=None, versionned=True):
         self._name = None
         self._uvname = None
         self._package = None
@@ -69,10 +79,11 @@ class MigrationItem(object):
             value = value[1:]
         parts = value.split('/', 3)
         package = parts[0]
+        suite_name = self.__class__._suites.primary_source_suite.name
         if '_' in package:
-            self._package, self._suite = package.split('_', 2)
+            self._package, suite_name = package.split('_', 2)
         else:
-            self._package, self._suite = (package, 'unstable')
+            self._package = package
         if self._versionned and len(parts) > 1:
             if len(parts) == 3:
                 self._architecture = parts[1]
@@ -95,7 +106,9 @@ class MigrationItem(object):
                self._architecture.split('_', 2)
 
         if self.is_removal:
-            self._suite = 'testing'
+            self._suite = self.__class__._suites.target_suite
+        else:
+            self._suite = self.__class__._suites.by_name_or_alias[suite_name]
 
         self._canonicalise_name()
 
@@ -106,8 +119,8 @@ class MigrationItem(object):
             self._uvname = self._package
         else:
             self._uvname = "%s/%s" % (self._package, self._architecture)
-        if self._suite not in ('testing', 'unstable'):
-            self._uvname = '%s_%s' % (self._uvname, self._suite)
+        if self._suite.suite_class.is_additional_source:
+            self._uvname = '%s_%s' % (self._uvname, self._suite.suite_short_name)
         if is_removal:
             self._uvname = '-%s' % (self._uvname)
         if self._versionned:
@@ -133,7 +146,7 @@ class MigrationItem(object):
 
     @suite.setter
     def suite(self, value):
-        self._suite = value
+        self._suite = self.__class__._suites[value]
         self._canonicalise_name()
 
     @property
diff --git a/britney2/utils.py b/britney2/utils.py
index 001f7df..f082602 100644
--- a/britney2/utils.py
+++ b/britney2/utils.py
@@ -128,8 +128,8 @@ def undo_changes(lundo, inst_tester, sources, binaries, all_binary_packages):
     # STEP 2
     # undo all new binaries (consequence of the above)
     for (undo, item) in lundo:
-        if not item.is_removal and item.package in sources[item.suite]:
-            source_data = sources[item.suite][item.package]
+        if not item.is_removal and item.package in sources[item.suite.name]:
+            source_data = sources[item.suite.name][item.package]
             for pkg_id in source_data.binaries:
                 binary, _, arch = pkg_id
                 if item.architecture in ['source', arch]:
@@ -356,7 +356,7 @@ def make_migrationitem(package, sources):
     """
     
     item = UnversionnedMigrationItem(package)
-    return MigrationItem("%s/%s" % (item.uvname, sources[item.suite][item.package].version))
+    return MigrationItem("%s/%s" % (item.uvname, sources[item.suite.name][item.package].version))
 
 
 def write_excuses(excuselist, dest_file, output_format="yaml"):
diff --git a/tests/test_hint_parser.py b/tests/test_hint_parser.py
index 834c179..544c031 100644
--- a/tests/test_hint_parser.py
+++ b/tests/test_hint_parser.py
@@ -1,10 +1,19 @@
-import logging
 import unittest
 
+from britney2 import Suite, Suites, SuiteClass
 from britney2.hints import HintParser, single_hint_taking_list_of_packages
+from britney2.migrationitem import MigrationItem
 
 from . import HINTS_ALL, TEST_HINTER
 
+SUITES = Suites(
+    Suite(SuiteClass.TARGET_SUITE, 'testing', "/somewhere/target", ''),
+    [Suite(SuiteClass.PRIMARY_SOURCE_SUITE, 'unstable', "/somewhere/source", '')],
+)
+
+
+MigrationItem.set_suites(SUITES)
+
 
 def new_hint_parser():
     return HintParser()
diff --git a/tests/test_policy.py b/tests/test_policy.py
index 22d0ef4..fc839de 100644
--- a/tests/test_policy.py
+++ b/tests/test_policy.py
@@ -4,6 +4,7 @@ import os
 from britney2 import Suites, Suite, SuiteClass, SourcePackage
 from britney2.excuse import Excuse
 from britney2.hints import HintParser
+from britney2.migrationitem import MigrationItem
 from britney2.policies.policy import AgePolicy, RCBugPolicy, PiupartsPolicy, PolicyVerdict
 
 from . import MockObject, TEST_HINTER, HINTS_ALL, DEFAULT_URGENCY
@@ -22,6 +23,7 @@ def initialize_policy(test_name, policy_class, *args, **kwargs):
         Suite(SuiteClass.TARGET_SUITE, 'testing', os.path.join(test_dir, 'testing'), ''),
         [Suite(SuiteClass.PRIMARY_SOURCE_SUITE, 'unstable', os.path.join(test_dir, 'unstable'), '')],
     )
+    MigrationItem.set_suites(suite_info)
     policy = policy_class(options, suite_info, *args)
     fake_britney = MockObject(log=lambda x, y='I': None)
     hint_parser = HintParser()