diff --git a/sys/fs/smbfs/smbfs_subr.c b/sys/fs/smbfs/smbfs_subr.c
index 1d26ac1648cc..a91cc799a00a 100644
--- a/sys/fs/smbfs/smbfs_subr.c
+++ b/sys/fs/smbfs/smbfs_subr.c
@@ -122,7 +122,7 @@ smb_time_server2local(u_long seconds, int tzoff, struct timespec *tsp)
 /*
  * Number of seconds between 1970 and 1601 year
  */
-int64_t DIFF1970TO1601 = 11644473600ULL;
+static int64_t DIFF1970TO1601 = 11644473600ULL;
 
 /*
  * Time from server comes as UTC, so no need to use tz