diff --git a/test/test_oeffis.py b/test/test_oeffis.py
index c68b6d8..1650b34 100644
--- a/test/test_oeffis.py
+++ b/test/test_oeffis.py
@@ -115,7 +115,7 @@ class LibOeffis(object):
 
     @staticmethod
     def _cdll():
-        return ctypes.CDLL("liboeffis.so", use_errno=True)
+        return ctypes.CDLL("liboeffis.so.1", use_errno=True)
 
     @classmethod
     def _load(cls):