diff --git a/britney.py b/britney.py
index 200a4e9..9181913 100755
--- a/britney.py
+++ b/britney.py
@@ -213,7 +213,7 @@ from migrationitem import MigrationItem, HintItem
 from hints import HintCollection
 from britney import buildSystem
 from britney_util import (old_libraries_format, same_source, undo_changes,
-                          ifilter_except, ifilter_only)
+                          register_reverses)
 from consts import (VERSION, SECTION, BINARIES, MAINTAINER, FAKESRC,
                    SOURCE, SOURCEVER, ARCHITECTURE, DEPENDS, CONFLICTS,
                    PROVIDES, RDEPENDS, RCONFLICTS)
@@ -566,52 +566,12 @@ class Britney(object):
             packages[pkg] = dpkg
 
         # loop again on the list of packages to register reverse dependencies and conflicts
-        register_reverses = self.register_reverses
         for pkg in packages:
             register_reverses(pkg, packages, provides, check_doubles=False)
 
         # return a tuple with the list of real and virtual packages
         return (packages, provides)
 
-    def register_reverses(self, pkg, packages, provides, check_doubles=True, parse_depends=apt_pkg.parse_depends):
-        """Register reverse dependencies and conflicts for the specified package
-
-        This method registers the reverse dependencies and conflicts for
-        a given package using `packages` as the list of packages and `provides`
-        as the list of virtual packages.
-
-        The method has an optional parameter parse_depends which is there
-        just for performance reasons and is not meant to be overwritten.
-        """
-        # register the list of the dependencies for the depending packages
-        dependencies = []
-        if packages[pkg][DEPENDS]:
-            dependencies.extend(parse_depends(packages[pkg][DEPENDS], False))
-        # go through the list
-        for p in dependencies:
-            for a in p:
-                # register real packages
-                if a[0] in packages and (not check_doubles or pkg not in packages[a[0]][RDEPENDS]):
-                    packages[a[0]][RDEPENDS].append(pkg)
-                # also register packages which provide the package (if any)
-                if a[0] in provides:
-                    for i in provides.get(a[0]):
-                        if i not in packages: continue
-                        if not check_doubles or pkg not in packages[i][RDEPENDS]:
-                            packages[i][RDEPENDS].append(pkg)
-        # register the list of the conflicts for the conflicting packages
-        if packages[pkg][CONFLICTS]:
-            for p in parse_depends(packages[pkg][CONFLICTS], False):
-                for a in p:
-                    # register real packages
-                    if a[0] in packages and (not check_doubles or pkg not in packages[a[0]][RCONFLICTS]):
-                        packages[a[0]][RCONFLICTS].append(pkg)
-                    # also register packages which provide the package (if any)
-                    if a[0] in provides:
-                        for i in provides[a[0]]:
-                            if i not in packages: continue
-                            if not check_doubles or pkg not in packages[i][RCONFLICTS]:
-                                packages[i][RCONFLICTS].append(pkg)
      
     def read_bugs(self, basedir):
         """Read the release critial bug summary from the specified directory
@@ -2031,7 +1991,7 @@ class Britney(object):
             for p in source[BINARIES]:
                 binary, parch = p.split("/")
                 if item.architecture not in ['source', parch]: continue
-                self.register_reverses(binary, binaries[parch][0] , binaries[parch][1])
+                register_reverses(binary, binaries[parch][0] , binaries[parch][1])
 
             # add/update the source package
             if item.architecture == 'source':
diff --git a/britney_util.py b/britney_util.py
index dee520b..45b5ac1 100644
--- a/britney_util.py
+++ b/britney_util.py
@@ -18,10 +18,14 @@
 # GNU General Public License for more details.
 
 
+import apt_pkg
 from functools import partial
 from itertools import ifilter, ifilterfalse
 import re
-from consts import BINARIES, PROVIDES
+
+
+from consts import (BINARIES, PROVIDES, DEPENDS, CONFLICTS,
+                    RDEPENDS, RCONFLICTS)
 
 binnmu_re = re.compile(r'^(.*)\+b\d+$')
 
@@ -157,3 +161,46 @@ def old_libraries_format(libs):
             libraries[pkg] = [arch]
     return "\n".join("  " + k + ": " + " ".join(libraries[k]) for k in libraries) + "\n"
 
+
+
+def register_reverses(pkg, packages, provides, check_doubles=True,
+                      parse_depends=apt_pkg.parse_depends,
+                      RDEPENDS=RDEPENDS, RCONFLICTS=RCONFLICTS):
+    """Register reverse dependencies and conflicts for the specified package
+
+    This method registers the reverse dependencies and conflicts for
+    a given package using `packages` as the list of packages and `provides`
+    as the list of virtual packages.
+
+    The "X=X" parameters are optimizations to avoid "load global" in
+    the loops.
+    """
+    # register the list of the dependencies for the depending packages
+    dependencies = []
+    if packages[pkg][DEPENDS]:
+        dependencies.extend(parse_depends(packages[pkg][DEPENDS], False))
+    # go through the list
+    for p in dependencies:
+        for a in p:
+                # register real packages
+            if a[0] in packages and (not check_doubles or pkg not in packages[a[0]][RDEPENDS]):
+                packages[a[0]][RDEPENDS].append(pkg)
+            # also register packages which provide the package (if any)
+            if a[0] in provides:
+                for i in provides.get(a[0]):
+                    if i not in packages: continue
+                    if not check_doubles or pkg not in packages[i][RDEPENDS]:
+                        packages[i][RDEPENDS].append(pkg)
+    # register the list of the conflicts for the conflicting packages
+    if packages[pkg][CONFLICTS]:
+        for p in parse_depends(packages[pkg][CONFLICTS], False):
+            for a in p:
+                # register real packages
+                if a[0] in packages and (not check_doubles or pkg not in packages[a[0]][RCONFLICTS]):
+                    packages[a[0]][RCONFLICTS].append(pkg)
+                # also register packages which provide the package (if any)
+                if a[0] in provides:
+                    for i in provides[a[0]]:
+                        if i not in packages: continue
+                        if not check_doubles or pkg not in packages[i][RCONFLICTS]:
+                            packages[i][RCONFLICTS].append(pkg)