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-rw-r--r--source/pdf/pdf-stream.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/source/pdf/pdf-stream.c b/source/pdf/pdf-stream.c
index 871ea40e..3650bd66 100644
--- a/source/pdf/pdf-stream.c
+++ b/source/pdf/pdf-stream.c
@@ -472,7 +472,7 @@ pdf_load_raw_stream_number(fz_context *ctx, pdf_document *doc, int num)
}
static int
-pdf_guess_filter_length(int len, char *filter)
+pdf_guess_filter_length(int len, const char *filter)
{
if (!strcmp(filter, "ASCIIHexDecode"))
return len / 2;