diff --git a/src/OpenSSL/_util.py b/src/OpenSSL/_util.py
index e5ea0205..41a64526 100644
--- a/src/OpenSSL/_util.py
+++ b/src/OpenSSL/_util.py
@@ -14,7 +14,7 @@
 
 binding = Binding()
 ffi = binding.ffi
-lib = binding.lib
+lib: Any = binding.lib
 
 
 # This is a special CFFI allocator that does not bother to zero its memory