diff --git a/ulha b/ulha
index 5158124..2f5b935 100755
--- a/ulha
+++ b/ulha
@@ -18,16 +18,16 @@ Version: 1.3
 Licence: BSD
 """
 import os
-import sys
 import re
 import shutil
-from subprocess import call, check_call, CalledProcessError
-from tempfile import mkdtemp, mkstemp
+import subprocess
+import sys
+import tempfile
 
-from extfslib import Archive, parse_args
+import extfslib
 
 
-class ULha(Archive):
+class ULha(extfslib.Archive):
     """Archive handle. Provides interface to MC's extfs subsystem"""
 
     LINE_PAT = re.compile(b"^((?P<perms>[d-][rswx-]{9})|(\[generic\])|"
@@ -116,7 +116,7 @@ class ULha(Archive):
 
     def run(self, dst):
         """Execute file out of archive"""
-        fdesc, tmp_file = mkstemp()
+        fdesc, tmp_file = tempfile.mkstemp()
         os.close(fdesc)
         result = 0
 
@@ -126,7 +126,7 @@ class ULha(Archive):
         os.chmod(tmp_file, int("700", 8))
 
         try:
-            result = call([tmp_file])
+            result = subprocess.call([tmp_file])
         finally:
             try:
                 os.unlink(tmp_file)
@@ -144,7 +144,7 @@ class ULha(Archive):
         If src is empty, create empty directory with dst name."""
         current_dir = os.path.abspath(os.curdir)
 
-        tmpdir = mkdtemp()
+        tmpdir = tempfile.mkdtemp()
         arch_abspath = os.path.realpath(self._arch)
         os.chdir(tmpdir)
         if src:
@@ -154,10 +154,10 @@ class ULha(Archive):
             os.makedirs(dst)
 
         try:
-            result = check_call([self.ARCHIVER.decode('utf-8'),
+            result = subprocess.check_call([self.ARCHIVER.decode('utf-8'),
                                  self.CMDS["write"].decode('utf-8'),
                                  arch_abspath, dst])
-        except CalledProcessError:
+        except subprocess.CalledProcessError:
             return 1
         finally:
             os.chdir(current_dir)
@@ -169,9 +169,9 @@ class ULha(Archive):
         src = self._get_real_name(src)
         fobj = open(dst, "wb")
         try:
-            result = check_call([self.ARCHIVER, self.CMDS['read'], self._arch,
+            result = subprocess.check_call([self.ARCHIVER, self.CMDS['read'], self._arch,
                                  src], stdout=fobj)
-        except CalledProcessError:
+        except subprocess.CalledProcessError:
             return 1
         finally:
             fobj.close()
@@ -179,4 +179,4 @@ class ULha(Archive):
 
 
 if __name__ == "__main__":
-    sys.exit(parse_args(ULha))
+    sys.exit(extfslib.parse_args(ULha))