fix trivial typo
diff --git a/iptables.c b/iptables.c
index d181578..b2de559 100644
--- a/iptables.c
+++ b/iptables.c
@@ -337,7 +337,7 @@
 exit_tryhelp(int status)
 {
 	if (line != -1)
-		fprintf(stderr, "Error occured at line: %d\n", line);
+		fprintf(stderr, "Error occurred at line: %d\n", line);
 	fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
 			program_name, program_name );
 	exit(status);