diff --git a/src/apps/common/ns_turn_utils.c b/src/apps/common/ns_turn_utils.c
index 85a1aead..7ca70f86 100644
--- a/src/apps/common/ns_turn_utils.c
+++ b/src/apps/common/ns_turn_utils.c
@@ -867,11 +867,11 @@ char *turn_strdup_func(const char* s, const char* function, int line) {
 
 ////////////////////////////////
 
-int is_secure_username(const u08bits *username)
+int is_secure_string(const u08bits *string)
 {
 	int ret = 0;
-	if(username) {
-		unsigned char *s0 = (unsigned char*)turn_strdup((const char*)username);
+	if(string) {
+		unsigned char *s0 = (unsigned char*)turn_strdup((const char*)string);
 		unsigned char *s = s0;
 		while(*s) {
 			*s = (unsigned char)tolower((int)*s);
@@ -891,4 +891,3 @@ int is_secure_username(const u08bits *username)
 }
 
 //////////////////////////////////////////////////////////////////
-
diff --git a/src/apps/common/ns_turn_utils.h b/src/apps/common/ns_turn_utils.h
index 809a04c4..d3890d32 100644
--- a/src/apps/common/ns_turn_utils.h
+++ b/src/apps/common/ns_turn_utils.h
@@ -78,7 +78,7 @@ void rollover_logfile(void);
 
 ///////////////////////////////////////////////////////
 
-int is_secure_username(const u08bits *username);
+int is_secure_string(const u08bits *string);
 
 ///////////////////////////////////////////////////////
 
diff --git a/src/apps/relay/mainrelay.c b/src/apps/relay/mainrelay.c
index 5611ed51..4c9ced52 100644
--- a/src/apps/relay/mainrelay.c
+++ b/src/apps/relay/mainrelay.c
@@ -1790,7 +1790,7 @@ static int adminmain(int argc, char **argv)
 #endif
         case 'u':
             STRCPY(user,optarg);
-            if(!is_secure_username((u08bits*)user)) {
+            if(!is_secure_string((u08bits*)user)) {
                 TURN_LOG_FUNC(TURN_LOG_LEVEL_ERROR, "Wrong user name structure or symbols, choose another name: %s\n",user);
                 exit(-1);
             }
diff --git a/src/server/ns_turn_server.c b/src/server/ns_turn_server.c
index 008a5e40..36d18b30 100644
--- a/src/server/ns_turn_server.c
+++ b/src/server/ns_turn_server.c
@@ -1029,7 +1029,7 @@ static int handle_turn_allocate(turn_turnserver *server,
 					}
 					ns_bcopy(value,username,ulen);
 					username[ulen]=0;
-					if(!is_secure_username(username)) {
+					if(!is_secure_string(username)) {
 						TURN_LOG_FUNC(TURN_LOG_LEVEL_ERROR, "%s: wrong username: %s\n", __FUNCTION__, (char*)username);
 						username[0]=0;
 						*err_code = 400;
@@ -3383,7 +3383,7 @@ static int check_stun_auth(turn_turnserver *server,
 	ns_bcopy(stun_attr_get_value(sar),usname,alen);
 	usname[alen]=0;
 
-	if(!is_secure_username(usname)) {
+	if(!is_secure_string(usname)) {
 		TURN_LOG_FUNC(TURN_LOG_LEVEL_ERROR, "%s: wrong username: %s\n", __FUNCTION__, (char*)usname);
 		usname[0]=0;
 		*err_code = 400;