diff --git a/classes/sysmocom-archiver.bbclass b/classes/sysmocom-archiver.bbclass
index 3bc84b0..b3ac877 100644
--- a/classes/sysmocom-archiver.bbclass
+++ b/classes/sysmocom-archiver.bbclass
@@ -7,6 +7,10 @@ ARCHIVE_TYPE ?= "TAR SRPM"
 DISTRO ?= "poky"
 PATCHES_ARCHIVE_WITH_SERIES = 'TRUE'
 
+
+def compat_cmp(a, b):
+    return (a>b)-(a<b)
+
 def get_bb_inc(d):
     '''create a directory "script-logs" including .bb and .inc file in ${WORKDIR}'''
     import re
@@ -83,7 +87,7 @@ def get_series(d):
     locals = (fetch.localpath(url) for url in fetch.urls)
     for local in locals:
         src_patches.append(local)
-    if not cmp(work_dir,s):
+    if not compat_cmp(work_dir,s):
         tmp_list = src_patches
     else:
         tmp_list = src_patches[1:]
@@ -178,7 +182,7 @@ def archive_sources_from_directory(d,stage_name):
         try:
             source_dir = os.path.join(work_dir,[ i for i in s.replace(work_dir,'').split('/') if i][0])
         except IndexError:
-            if not cmp(s,work_dir):
+            if not compat_cmp(s,work_dir):
                 return ''
     else:
         return ''