diff -ur mozilla-release/python/mach/mach/main.py mozilla-release.new/python/mach/mach/main.py
--- mozilla-release/python/mach/mach/main.py	2015-04-03 05:30:08.000000000 +0300
+++ mozilla-release.new/python/mach/mach/main.py	2015-04-20 13:03:05.743443939 +0300
@@ -261,7 +261,7 @@
                 mod = imp.new_module(b'mach.commands')
                 sys.modules[b'mach.commands'] = mod
 
-            module_name = 'mach.commands.%s' % uuid.uuid1().get_hex()
+            module_name = 'mach.commands.%s' % uuid.uuid4().get_hex()
 
         try:
             imp.load_source(module_name, path)