diff --git a/lib/crc32.c b/lib/crc32.c
index 3481782..275edb4 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -42,7 +42,7 @@
   the information needed to generate CRC's on data a byte at a time for all
   combinations of CRC register values and incoming bytes.
 */
-static void make_crc_table()
+static void make_crc_table(void)
 {
   ulong c;
   int n, k;