diff --git a/md5sum.c b/md5sum.c
index 86fb40f..224b20e 100644
--- a/md5sum.c
+++ b/md5sum.c
@@ -28,6 +28,10 @@ main(int argc, char *argv[])
 	uint8_t md[MD5_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha1sum.c b/sha1sum.c
index 4f3ae77..cc8dcae 100644
--- a/sha1sum.c
+++ b/sha1sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA1_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha224sum.c b/sha224sum.c
index 5c4a6cb..e9a10cf 100644
--- a/sha224sum.c
+++ b/sha224sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA224_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha256sum.c b/sha256sum.c
index d863539..686c70f 100644
--- a/sha256sum.c
+++ b/sha256sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA256_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha384sum.c b/sha384sum.c
index f975b61..c76947e 100644
--- a/sha384sum.c
+++ b/sha384sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA384_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha512-224sum.c b/sha512-224sum.c
index 6e4a9d6..53f2e62 100644
--- a/sha512-224sum.c
+++ b/sha512-224sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA512_224_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha512-256sum.c b/sha512-256sum.c
index c2d582e..ea556b8 100644
--- a/sha512-256sum.c
+++ b/sha512-256sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA512_256_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;
diff --git a/sha512sum.c b/sha512sum.c
index 65a0c2c..a76e685 100644
--- a/sha512sum.c
+++ b/sha512sum.c
@@ -27,6 +27,10 @@ main(int argc, char *argv[])
 	uint8_t md[SHA512_DIGEST_LENGTH];
 
 	ARGBEGIN {
+	case 'b':
+	case 't':
+		/* ignore */
+		break;
 	case 'c':
 		cryptfunc = cryptcheck;
 		break;