diff --git a/README b/README
index 4a454f9..b9c5376 100644
--- a/README
+++ b/README
@@ -14,9 +14,9 @@ Key and signature formats
 
 EVM support (v2) in latest version of the kernel adds the file system UUID to
 the HMAC calculation. It is controlled by the CONFIG_EVM_HMAC_VERSION and
-version 2 is enabled by default. To include the UUID to the signature calculation,
-it is necessary to provide '--uuid' or '-u' parameter to the 'sign' command.
-UUID can be provided on command line in form of '-uUUID' or '--uuid=UUID'.
+version 2 is enabled by default. In this version default UUID is included by
+default. Custom value can be supplied via '--uuid=UUID' or '-uUUID' parameter
+to the 'sign' command. To use old format HMAC format use '-' as a parameter.
 
 Latest kernel got IMA/EVM support for using X509 certificates and asymmetric key
 support for verifying digital signatures. This version uses x509 format by default.
@@ -121,7 +121,7 @@ Default private key: /etc/keys/privkey_evm.pem
 Default X509 certificate: /etc/keys/x509_evm.der
 
 Signing for using old RSA format is done using '-1' or '--rsa' parameter.
-Signing for using new the EVM HMAC format is done using '-u' or '--uuid' parameter.
+Signing for using old EVM HMAC format is done using '-u-' or '--uuid=-' parameter.
 
 Sign file with EVM signature and use hash value for IMA - common case
 
diff --git a/src/evmctl.c b/src/evmctl.c
index 9cba307..f6e3fac 100644
--- a/src/evmctl.c
+++ b/src/evmctl.c
@@ -72,7 +72,7 @@ static int digsig;
 static char *keypass;
 static int sigfile;
 static int modsig;
-static char *uuid_str;
+static char *uuid_str = "+";
 static char *search_type;
 static int recursive;
 static dev_t fs_dev;
@@ -434,7 +434,7 @@ static int get_uuid(struct stat *st, char *uuid)
 	FILE *fp;
 	size_t len;
 
-	if (uuid_str[0] != '-')
+	if (uuid_str[0] != '+')
 		return pack_uuid(uuid_str, uuid);
 
 	dev = st->st_dev;
@@ -540,7 +540,7 @@ static int calc_evm_hash(const char *file, unsigned char *hash)
 		return 1;
 	}
 
-	if (uuid_str) {
+	if (*uuid_str != '-') {
 		err = get_uuid(&st, uuid);
 		if (err)
 			return -1;
@@ -1604,7 +1604,7 @@ int main(int argc, char *argv[])
 			xattr = 0;
 			break;
 		case 'u':
-			uuid_str = optarg ?: "-";
+			uuid_str = optarg ?: "+";
 			break;
 		case '1':
 			params.x509 = 0;