diff --git a/dfvfs/resolver_helpers/__init__.py b/dfvfs/resolver_helpers/__init__.py
index 3918c411..d6e98154 100644
--- a/dfvfs/resolver_helpers/__init__.py
+++ b/dfvfs/resolver_helpers/__init__.py
@@ -23,6 +23,11 @@
 except ImportError:
   pass
 
+try:
+  from dfvfs.resolver_helpers import ext_resolver_helper
+except ImportError:
+  pass
+
 from dfvfs.resolver_helpers import fake_resolver_helper
 
 try: