diff --combined src/timezone/zic.c
index d605c721ec,d605c721ec..0000000000
--- a/src/timezone/zic.c
+++ b/src/timezone/zic.c
@@@ -975,7 -975,7 +975,7 @@@ relname(char const *target, char const 
  		if (f[i] == '/')
  			dir_len = i + 1;
  	for (; linkname[i]; i++)
--		dotdots += linkname[i] == '/' && linkname[i - 1] != '/';
++		dotdots += i > 0 && linkname[i] == '/' && linkname[i - 1] != '/';
  	taillen = strlen(f + dir_len);
  	dotdotetcsize = 3 * dotdots + taillen + 1;
  	if (dotdotetcsize <= linksize)