--- a/channels/chan_unistim.c
+++ b/channels/chan_unistim.c
@@ -1351,7 +1351,7 @@ static void refresh_all_favorite(struct unistimsession *pte)
 
 static int is_key_favorite(struct unistim_device *d, int fav)
 {
-       if ((fav < 0) && (fav > 5)) {
+       if ((fav < 0) || (fav >= FAVNUM)) {
                return 0;
        }
        if (d->sline[fav]) {
@@ -1365,7 +1365,7 @@ static int is_key_favorite(struct unistim_device *d, int fav)
 
 static int is_key_line(struct unistim_device *d, int fav)
 {
-       if ((fav < 0) && (fav > 5)) {
+       if ((fav < 0) || (fav >= FAVNUM)) {
                return 0;
        }
        if (!d->sline[fav]) {