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-rw-r--r--src/cow_ws.erl2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cow_ws.erl b/src/cow_ws.erl
index 611bfef..dcc81a5 100644
--- a/src/cow_ws.erl
+++ b/src/cow_ws.erl
@@ -580,7 +580,7 @@ masked_frame({binary, Payload}, _) ->
[<< 1:1, 0:3, 2:4, 1:1, Len/bits >>, MaskKeyBin, mask(iolist_to_binary(Payload), MaskKey, <<>>)].
payload_length(Payload) ->
- case byte_size(Payload) of
+ case iolist_size(Payload) of
N when N =< 125 -> << N:7 >>;
N when N =< 16#ffff -> << 126:7, N:16 >>;
N when N =< 16#7fffffffffffffff -> << 127:7, N:64 >>