diff --git a/fdroidserver/update.py b/fdroidserver/update.py
index b03258ba..4647ed09 100644
--- a/fdroidserver/update.py
+++ b/fdroidserver/update.py
@@ -159,7 +159,7 @@ def main():
         # Get the signature (or md5 of, to be precise)...
         p = subprocess.Popen(['java', 'getsig',
                               os.path.join(os.getcwd(), apkfile)],
-                             cwd=os.path.join(sys.path[0], 'getsig'),
+                             cwd=os.path.join(os.path.dirname(__file__), 'getsig'),
                              stdout=subprocess.PIPE)
         output = p.communicate()[0]
         if options.verbose: