diff --git a/pisi/pgraph.py b/pisi/pgraph.py
index b3c942f3..0bef13e5 100644
--- a/pisi/pgraph.py
+++ b/pisi/pgraph.py
@@ -19,7 +19,7 @@ class PGraph(digraph):
         if not pkg in self.vertices():
             pkg2 = packagedb.get_package(depinfo.package)
 
-        self.add_edge(pkg, depinfo.package, ('d', depinfo),
+        self.add_edge(str(pkg), str(depinfo.package), ('d', depinfo),
                       (pkg1.version, pkg1.release),
                       (pkg2.version, pkg2.release) )
 
@@ -31,7 +31,7 @@ class PGraph(digraph):
         if not pkg in self.vertices():
             pkg2 = packagedb.get_package(depinfo.package)
 
-        self.add_biedge(pkg, conflinfo.package, ('c', conflinfo)
+        self.add_biedge(str(pkg), str(conflinfo.package), ('c', conflinfo)
                         (pkg1.version, pkg1.release),
                         (pkg2.version, pkg2.release) )
 
diff --git a/pisi/toplevel.py b/pisi/toplevel.py
index fc434f6e..343bbee7 100644
--- a/pisi/toplevel.py
+++ b/pisi/toplevel.py
@@ -58,6 +58,7 @@ def install_pkg_names(A):
 
     # find the "install closure" graph of G_f by package 
     # set A using packagedb
+    print A
     B = A
     state = {}
     while len(B) > 0:
@@ -73,7 +74,9 @@ def install_pkg_names(A):
                     G_f.add_dep(x, dep)
         B = Bp
     G_f.write_graphviz(sys.stdout)
-
+    l = G_f.topological_sort()
+    l.reverse()
+    print l
 
 def remove(packages):
     #TODO: this for loop is just a placeholder