diff --git a/pkt-line.c b/pkt-line.c
index c9ed780d0b..a0e87b1e81 100644
--- a/pkt-line.c
+++ b/pkt-line.c
@@ -119,7 +119,7 @@ void packet_buf_delim(struct strbuf *buf)
 	strbuf_add(buf, "0001", 4);
 }
 
-void set_packet_header(char *buf, const int size)
+void set_packet_header(char *buf, int size)
 {
 	static char hexchar[] = "0123456789abcdef";