diff --git a/lib/safe-write.c b/lib/safe-write.c
index 564fc5021..942d65073 100644
--- a/lib/safe-write.c
+++ b/lib/safe-write.c
@@ -61,7 +61,7 @@ extern int errno;
    Return the actual number of bytes written, zero for EOF, or SAFE_WRITE_ERROR
    upon error.  */
 size_t
-safe_write (int fd, const void *buf, size_t count)
+safe_write (int fd, void const *buf, size_t count)
 {
   ssize_t result;