diff --git a/src/riakc_pb_socket.erl b/src/riakc_pb_socket.erl
index fd361c1e..b8a5d7de 100644
--- a/src/riakc_pb_socket.erl
+++ b/src/riakc_pb_socket.erl
@@ -122,7 +122,7 @@
 -type index_opt() :: {timeout, timeout()} |
                      {call_timeout, timeout()} |
                      {stream, boolean()} |
-                     {continuation, binary()} |
+                     {continuation, continuation()} |
                      {pagination_sort, boolean()} |
                      {max_results, non_neg_integer() | all}.
 -type index_opts() :: [index_opt()].