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-rw-r--r--src/include/libpq/libpq.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index 13d8143a893..8defcb6de19 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -92,7 +92,7 @@ extern void secure_destroy(void);
extern int secure_open_server(Port *port);
extern void secure_close(Port *port);
extern ssize_t secure_read(Port *port, void *ptr, size_t len);
-extern ssize_t secure_write(Port *port, void *ptr, size_t len);
+extern ssize_t secure_write(Port *port, const void *ptr, size_t len);
extern ssize_t secure_raw_read(Port *port, void *ptr, size_t len);
extern ssize_t secure_raw_write(Port *port, const void *ptr, size_t len);