diff --git a/src/lib/pyelliptic/openssl.py b/src/lib/pyelliptic/openssl.py
index 12953788..54858a9b 100644
--- a/src/lib/pyelliptic/openssl.py
+++ b/src/lib/pyelliptic/openssl.py
@@ -8,6 +8,7 @@
 
 import sys
 import ctypes
+import ctypes.util
 import logging
 import os