--- a/src/fasta_formatter/fasta_formatter.cpp
+++ b/src/fasta_formatter/fasta_formatter.cpp
@@ -103,6 +103,7 @@
 		switch(opt) {
 		case 'h':
 			usage();
+			exit(EXIT_SUCCESS);
 		
 		case 'i':
 			input_filename = optarg;