diff --git a/include/linux/security.h b/include/linux/security.h
index f4eb32d5b8907303e068edf82166bef17a7148f2..10a09257952b76560a16970eb4c154c320072fe7 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -2988,7 +2988,10 @@ static inline int security_key_getsecurity(struct key *key, char **_buffer)
 
 static inline int security_key_session_to_parent(const struct cred *cred,
 						 const struct cred *parent_cred,
-						 struct key *key);
+						 struct key *key)
+{
+	return 0;
+}
 
 #endif
 #endif /* CONFIG_KEYS */