diff --git a/ac3dec/ac3dec.c b/ac3dec/ac3dec.c
index c45148c..293a95c 100644
--- a/ac3dec/ac3dec.c
+++ b/ac3dec/ac3dec.c
@@ -134,7 +134,7 @@ int main(int argc,char *argv[])
 	while (1) {
 		int c;
 
-		if ((c = getopt_long(argc, argv, "hvc:D:46CPRZ:q", long_option, NULL)) < 0)
+		if ((c = getopt_long(argc, argv, "hvc:D:46HCPRZ:q", long_option, NULL)) < 0)
 			break;
 		switch (c) {
 		case 'h':