diff --git a/c/malloc_speed_test/pool_list.c b/c/malloc_speed_test/pool_list.c
index bafe9e0..4ff0f8d 100644
--- a/c/malloc_speed_test/pool_list.c
+++ b/c/malloc_speed_test/pool_list.c
@@ -74,27 +74,22 @@ inline void pool_free(void *p)
 
 	struct block_s *b1 = (struct block_s *)(p - 2 * sizeof(struct block_s *)),
 	               *b0 = b1->prev,
-		       *b2 = b1->next,
-		       *f1 = free_pool;
+		       *b2 = b1->next;
 
-	// cut block from free list
 	if (b0)
 		b0->next = b2;
 	if (b2)
 		b2->prev = b0;
 
-	// f1, b1
-	if (f1) {
-		b1->next = f1;
-		f1->prev = b1;
+	if (free_pool) {
+		b1->next = free_pool;
+		free_pool->prev = b1;
 	}
 	else
 		b1->next = NULL;
 
-	// free_pool
 	free_pool = b2;
 
-	// busy_pool
 	if (busy_pool == b1)
 		busy_pool = b2;
 }