diff --git a/installability/solver.py b/installability/solver.py
index 8ca402e..5841a10 100644
--- a/installability/solver.py
+++ b/installability/solver.py
@@ -45,8 +45,8 @@ class InstallabilitySolver(InstallabilityTester):
           - NB: arch:all packages are "re-mapped" to given architecture.
             (simplifies caches and dependency checking)
         """
-        InstallabilityTester.__init__(self, universe, revuniverse, testing,
-                                      broken, essentials, safe_set, eqv_table)
+        super(InstallabilitySolver, self).__init__(universe, revuniverse, testing,
+                                                   broken, essentials, safe_set, eqv_table)
 
 
     def solve_groups(self, groups):
diff --git a/migrationitem.py b/migrationitem.py
index fe934bc..1b94403 100644
--- a/migrationitem.py
+++ b/migrationitem.py
@@ -145,5 +145,5 @@ class MigrationItem(object):
         return self._uvname
 
 class UnversionnedMigrationItem(MigrationItem):
-    def __init__(self, name = None):
-        MigrationItem.__init__(self, name = name, versionned = False)
+    def __init__(self, name=None):
+        super(UnversionnedMigrationItem, self).__init__(name=name, versionned=False)