diff --git a/slixmpp_omemo/__init__.py b/slixmpp_omemo/__init__.py
index f97feb9..90fe7aa 100644
--- a/slixmpp_omemo/__init__.py
+++ b/slixmpp_omemo/__init__.py
@@ -78,9 +78,10 @@ def _load_device_id(data_dir: str) -> int:
 
     return did
 
-def fp_from_ik(ik: bytes) -> str:
+
+def fp_from_ik(identity_key: bytes) -> str:
     """Convert identityKey to a string representation (fingerprint)"""
-    return codecs.getencoder("hex")(ik)[0].decode("US-ASCII").upper()
+    return codecs.getencoder("hex")(identity_key)[0].decode("US-ASCII").upper()
 
 
 def _parse_bundle(backend: Backend, bundle: Bundle) -> ExtendedPublicBundle: