diff --git a/src/calibre/constants.py b/src/calibre/constants.py
index 7df28ce1d1..934b37de6a 100644
--- a/src/calibre/constants.py
+++ b/src/calibre/constants.py
@@ -168,7 +168,7 @@ class Plugins(collections.Mapping):
             plugins.extend(['winutil', 'wpd', 'winfonts'])
         if isosx:
             plugins.append('usbobserver')
-        if islinux or isosx or ishaiku:
+        if islinux or isosx:
             plugins.append('libusb')
             plugins.append('libmtp')
         self.plugins = frozenset(plugins)