--- a/build/mach_bootstrap.py
+++ b/build/mach_bootstrap.py
@@ -403,18 +403,17 @@ class ImportHook(object):
         # loading, remove the .pyc/.pyo file, and reload the module.
         # Since we already loaded the .pyc/.pyo module, if it had side
         # effects, they will have happened already, and loading the module
         # with the same name, from another directory may have the same side
         # effects (or different ones). We assume it's not a problem for the
         # python modules under our source directory (either because it
         # doesn't happen or because it doesn't matter).
         if not os.path.exists(module.__file__[:-1]):
-            if os.path.exists(module.__file__):
-                os.remove(module.__file__)
+            os.remove(module.__file__)
             del sys.modules[module.__name__]
             module = self(name, globals, locals, fromlist, level)
 
         return module
 
 
 # Install our hook
 __builtin__.__import__ = ImportHook(__builtin__.__import__)