diff --git a/src/cache.c b/src/cache.c
index 49673fcb..c86106a8 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -22,24 +22,28 @@ typedef struct {
 } thread_args;
 
 _Noreturn static void* check_cache(void* arg) {
-    __auto_type args = (thread_args*)arg;
+    const __auto_type args = (thread_args *)arg;
+    const __auto_type lock = args->lock;
+    const __auto_type table = args->table;
+    const __auto_type check_interval = args->check_interval;
+    free(args);
 
     while (true) {
-        pthread_rwlock_wrlock(args->lock);
+        pthread_rwlock_wrlock(lock);
 
         const time_t now = time(NULL);
         struct cache *cur, *tmp;
 
-        HASH_ITER(hh, not_http_dst_cache, cur, tmp) {
-            if (difftime(now, cur->last_time) > args->check_interval) {
+        HASH_ITER(hh, table, cur, tmp) {
+            if (difftime(now, cur->last_time) > check_interval) {
                 HASH_DEL(not_http_dst_cache, cur);
                 free(cur);
             }
         }
 
-        pthread_rwlock_unlock(args->lock);
+        pthread_rwlock_unlock(lock);
 
-        sleep(args->check_interval);
+        sleep(check_interval);
     }
 }