diff --git a/src/libcharon/sa/ike_sa_manager.c b/src/libcharon/sa/ike_sa_manager.c
index 9b9ad93a2..63c9fdfa8 100644
--- a/src/libcharon/sa/ike_sa_manager.c
+++ b/src/libcharon/sa/ike_sa_manager.c
@@ -2188,7 +2188,7 @@ METHOD(ike_sa_manager_t, flush, void,
 	unlock_all_segments(this);
 
 	this->spi_lock->write_lock(this->spi_lock);
-	this->rng->destroy(this->rng);
+	DESTROY_IF(this->rng);
 	this->rng = NULL;
 	this->spi_cb.cb = NULL;
 	this->spi_cb.data = NULL;