diff --git a/plugin.py b/plugin.py
index 111204a..5b9cced 100644
--- a/plugin.py
+++ b/plugin.py
@@ -25,6 +25,11 @@ from gajim.common  import app
 
 log = logging.getLogger('gajim.p.otr')
 
+try:  from Cryptodome import *
+except ImportError as e:
+    log.error(e)
+    ERROR = 'Cryptodome is missing'
+
 if not ERROR:
     try:
         from . import module