diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c
index cbe0152a800..4b3035cb7e0 100644
--- a/sys/kern/kern_exec.c
+++ b/sys/kern/kern_exec.c
@@ -1884,9 +1884,9 @@ exec_unregister(const struct execsw *execsw_arg)
  * Write out a core segment to the compression stream.
  */
 static int
-compress_chunk(struct coredump_params *cp, char *base, char *buf, u_int len)
+compress_chunk(struct coredump_params *cp, char *base, char *buf, size_t len)
 {
-	u_int chunk_len;
+	size_t chunk_len;
 	int error;
 
 	while (len > 0) {