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-rw-r--r--libcrystfel/src/stream.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/libcrystfel/src/stream.h b/libcrystfel/src/stream.h
index 0f28a4f8..9e92b35a 100644
--- a/libcrystfel/src/stream.h
+++ b/libcrystfel/src/stream.h
@@ -123,7 +123,7 @@ extern int stream_select_chunk(Stream *st, int chunk_number);
/* Read/write chunks */
extern struct image *stream_read_chunk(Stream *st, StreamFlags srf);
-extern int stream_write_chunk(Stream *st, struct image *image,
+extern int stream_write_chunk(Stream *st, const struct image *image,
StreamFlags srf);
#ifdef __cplusplus