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-rw-r--r--camel/camel-mime-filter.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/camel/camel-mime-filter.h b/camel/camel-mime-filter.h
index 6e729b13c2..65d8590fa5 100644
--- a/camel/camel-mime-filter.h
+++ b/camel/camel-mime-filter.h
@@ -76,7 +76,7 @@ void camel_mime_filter_complete(CamelMimeFilter *f,
void camel_mime_filter_reset(CamelMimeFilter *f);
/* sets/returns number of bytes backed up on the input */
-void camel_mime_filter_backup(CamelMimeFilter *f, char *data, size_t length);
+void camel_mime_filter_backup(CamelMimeFilter *f, const char *data, size_t length);
/* ensure this much size available for filter output */
void camel_mime_filter_set_size(CamelMimeFilter *f, size_t size, int keep);