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-rw-r--r--source/pdf/pdf-write.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/source/pdf/pdf-write.c b/source/pdf/pdf-write.c
index 1353f659..5e80cfa1 100644
--- a/source/pdf/pdf-write.c
+++ b/source/pdf/pdf-write.c
@@ -1757,7 +1757,7 @@ static void expandstream(fz_context *ctx, pdf_document *doc, pdf_write_state *op
pdf_drop_obj(ctx, obj);
}
-static int is_image_filter(char *s)
+static int is_image_filter(const char *s)
{
if (!strcmp(s, "CCITTFaxDecode") || !strcmp(s, "CCF") ||
!strcmp(s, "DCTDecode") || !strcmp(s, "DCT") ||