diff --git a/python/mozboot/mozboot/base.py b/python/mozboot/mozboot/base.py
index 7e1b06638c39..ab119356465f 100644
--- a/python/mozboot/mozboot/base.py
+++ b/python/mozboot/mozboot/base.py
@@ -10,7 +10,6 @@ import subprocess
 import sys
 
 from distutils.version import LooseVersion
-from distutils.version import StrictVersion
 
 
 NO_MERCURIAL = '''
@@ -76,7 +75,7 @@ We recommend the following tools for installing Python:
 # Upgrade Mercurial older than this.
 # This should match OLDEST_NON_LEGACY_VERSION from
 # tools/mercurial/hgsetup/wizard.py.
-MODERN_MERCURIAL_VERSION = StrictVersion('3.5.2')
+MODERN_MERCURIAL_VERSION = LooseVersion('3.5.2')
 
 # Upgrade Python older than this.
 MODERN_PYTHON_VERSION = LooseVersion('2.7.3')
@@ -294,7 +293,7 @@ class BaseBootstrapper(object):
             print('ERROR: Unable to identify Mercurial version.')
             return True, False, None
 
-        our = StrictVersion(match.group(1))
+        our = LooseVersion(match.group(1))
 
         return True, our >= MODERN_MERCURIAL_VERSION, our