--- a/modem.c
+++ b/modem.c
@@ -76,10 +76,11 @@ int tty_modem(char* send, char *receive) {
 	
 	int l=0, in=0, out=0, timeout=10;
 	char tmp[4096];
+	struct timespec h = {0, 100 * 1000 * 1000};
         	 
 	if (strlen(send)) {
 		while ((timeout--) > 0) {
-			usleep(100000);
+			nanosleep(&h, NULL);
 			ioctl(fd_modem,TIOCMGET,&out);
        	 		if (out & TIOCM_CTS) {
 				l=write(fd_modem,send,strlen(send));
@@ -97,7 +98,7 @@ int tty_modem(char* send, char *receive) {
 				strncat(receive,tmp,in); 
 				if (strchr(receive,'\r')) { break; }
 				}
-			else { usleep(100000); }
+			else { nanosleep(&h, NULL); }
 			}	
 		if (strlen(receive) > 0 && debug > 3) { fprintf(stderr, "%s\n", receive); }