diff --git a/britney.py b/britney.py
index 5d134f0..009ec79 100755
--- a/britney.py
+++ b/britney.py
@@ -1532,8 +1532,9 @@ class Britney(object):
         # the age-days hint, if specified for the package
         policy_verdict = excuse.policy_verdict
         policy_info = excuse.policy_info
+        suite_class = source_suite.suite_class
         for policy in self.policies:
-            if suite_name in policy.applicable_suites:
+            if suite_class in policy.applicable_suites:
                 v = policy.apply_policy(policy_info, suite_name, src, source_t, source_u, excuse)
                 if v.value > policy_verdict.value:
                     policy_verdict = v
diff --git a/britney2/policies/autopkgtest.py b/britney2/policies/autopkgtest.py
index e92eb16..24450ae 100644
--- a/britney2/policies/autopkgtest.py
+++ b/britney2/policies/autopkgtest.py
@@ -30,13 +30,17 @@ from urllib.request import urlopen
 import apt_pkg
 
 import britney2.hints
+
+from britney2 import SuiteClass
 from britney2.policies.policy import BasePolicy, PolicyVerdict
 
+
 class Result(Enum):
     FAIL = 1
     PASS = 2
     NEUTRAL = 3
 
+
 EXCUSES_LABELS = {
     "PASS": '<span style="background:#87d96c">Pass</span>',
     "NEUTRAL": '<span style="background:#e5c545">No test results</span>',
@@ -50,6 +54,7 @@ EXCUSES_LABELS = {
 
 REF_TRIG = 'migration-reference/0'
 
+
 def srchash(src):
     '''archive hash prefix for source package'''
 
@@ -67,7 +72,7 @@ class AutopkgtestPolicy(BasePolicy):
     """
 
     def __init__(self, options, suite_info):
-        super().__init__('autopkgtest', options, suite_info, {'unstable'})
+        super().__init__('autopkgtest', options, suite_info, {SuiteClass.PRIMARY_SOURCE_SUITE})
         # tests requested in this and previous runs
         # trigger -> src -> [arch]
         self.pending_tests = None
diff --git a/britney2/policies/policy.py b/britney2/policies/policy.py
index c066784..38e2211 100644
--- a/britney2/policies/policy.py
+++ b/britney2/policies/policy.py
@@ -7,6 +7,7 @@ from urllib.parse import quote
 
 import apt_pkg
 
+from britney2 import SuiteClass
 from britney2.hints import Hint, split_into_one_hint_per_package
 from britney2.policies import PolicyVerdict
 from britney2.utils import get_dependency_solvers
@@ -23,7 +24,7 @@ class BasePolicy(object):
         :param options The options member of Britney with all the
         config options.
 
-        :param applicable_suites A set of suite names where this
+        :param applicable_suites A set of suite classes where this
         policy applies.
         """
         self.policy_id = policy_id
@@ -92,7 +93,7 @@ class BasePolicy(object):
 
         :param source_data_srcdist Information about the source
         package in the source distribution (e.g. "unstable" or "tpu").
-        This is the data structure in
+        This is the data structure in suite.sources[source_name]
         Britney.sources[suite][source_name]
 
         :return A Policy Verdict (e.g. PolicyVerdict.PASS)
@@ -173,7 +174,7 @@ class AgePolicy(BasePolicy):
     """
 
     def __init__(self, options, suite_info, mindays):
-        super().__init__('age', options, suite_info, {'unstable'})
+        super().__init__('age', options, suite_info, {SuiteClass.PRIMARY_SOURCE_SUITE})
         self._min_days = mindays
         if options.default_urgency not in mindays:  # pragma: no cover
             raise ValueError("Missing age-requirement for default urgency (MINDAYS_%s)" % options.default_urgency)
@@ -408,7 +409,7 @@ class RCBugPolicy(BasePolicy):
     """
 
     def __init__(self, options, suite_info):
-        super().__init__('rc-bugs', options, suite_info, {'unstable'})
+        super().__init__('rc-bugs', options, suite_info, {SuiteClass.PRIMARY_SOURCE_SUITE})
         self._bugs = {}
 
     def register_hints(self, hint_parser):
@@ -535,7 +536,7 @@ class RCBugPolicy(BasePolicy):
 class PiupartsPolicy(BasePolicy):
 
     def __init__(self, options, suite_info):
-        super().__init__('piuparts', options, suite_info, {'unstable'})
+        super().__init__('piuparts', options, suite_info, {SuiteClass.PRIMARY_SOURCE_SUITE})
         self._piuparts = {
             'unstable': None,
             'testing': None,
@@ -637,7 +638,8 @@ class PiupartsPolicy(BasePolicy):
 class BuildDependsPolicy(BasePolicy):
 
     def __init__(self, options, suite_info):
-        super().__init__('build-depends', options, suite_info, {'unstable', 'tpu', 'pu'})
+        super().__init__('build-depends', options, suite_info,
+                         {SuiteClass.PRIMARY_SOURCE_SUITE, SuiteClass.ADDITIONAL_SOURCE_SUITE})
         self._britney = None
 
     def initialise(self, britney):