diff --git a/source/application/system_state.c b/source/application/system_state.c
index f5532ef..c26e733 100644
--- a/source/application/system_state.c
+++ b/source/application/system_state.c
@@ -160,6 +160,7 @@ static enum system_state handle_state_collision_turn(void)
 		drv_open(&rng);
 		// random number between 500 and 4000
 		unsigned int sleep = (unsigned int)drv_read(&rng, NULL, 0) % 3500 + 500;
+		drv_close(&rng);
 		system_state_object.collision_timer.tick = sys_tick_get_ms() + sleep;
 		system_state_object.collision_timer.running = true;
 		// randomize turn direction