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-rw-r--r--common/smtppass.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/smtppass.h b/common/smtppass.h
index d10bed1..701ecb9 100644
--- a/common/smtppass.h
+++ b/common/smtppass.h
@@ -101,7 +101,7 @@ int spio_read_line(struct spctx* ctx, spio_t* io, int opts);
* Guaranteed to accept all data or fail. */
int spio_write_data(struct spctx* ctx, spio_t* io, const char* data);
int spio_write_dataf(struct spctx* ctx, spio_t* io, const char* fmt, ...);
-int spio_write_data_raw(struct spctx* ctx, spio_t* io, unsigned char* buf, int len);
+int spio_write_data_raw(struct spctx* ctx, spio_t* io, const unsigned char* buf, int len);
/* Empty the given socket */
void spio_read_junk(struct spctx* sp, spio_t* io);