diff -Nrup a/src/match.c b/src/match.c
--- a/src/match.c	2010-07-01 10:10:49.000000000 -0600
+++ b/src/match.c	2019-10-15 13:22:20.023876156 -0600
@@ -367,7 +367,7 @@ int cidr_match(char *m, char *n, int cou
 /* Inline for cron_match (obviously).
  * Matches a single field of a crontab expression.
  */
-inline int cron_matchfld(char *mask, int match)
+static inline int cron_matchfld(char *mask, int match)
 {
   int skip = 0, f, t;
   char *p, *q;