diff --git a/pam_yubico.c b/pam_yubico.c
index f7a8fd3..30a2471 100644
--- a/pam_yubico.c
+++ b/pam_yubico.c
@@ -304,7 +304,7 @@ authorize_user_token_ldap (const char *ldap_uri,
 		      retval = 1;
 		    }
 		}
-	      ldap_value_free (vals);
+	      ldap_value_free_len (vals);
 	    }
 	  ldap_memfree (a);
 	}