diff --git a/ubb-la/gui.c b/ubb-la/gui.c
index 5dc5dec..a0ca7f6 100644
--- a/ubb-la/gui.c
+++ b/ubb-la/gui.c
@@ -460,8 +460,8 @@ void gui(const uint8_t *buf, int skip, int nibbles, double freq)
 					break;
 				case SDLK_RIGHT:
 					pos += pos_step(zoom);
-					if (pos > nibbles-1)
-						pos = nibbles-1;
+					if (pos > nibbles-skip-1)
+						pos = nibbles-skip-1;
 					break;
 				case SDLK_RETURN:
 				case SDLK_q: