diff --git a/include/haproxy/pool.h b/include/haproxy/pool.h
index 92fb6dfbf..d01c6d7c8 100644
--- a/include/haproxy/pool.h
+++ b/include/haproxy/pool.h
@@ -141,6 +141,7 @@ static inline void __pool_free(struct pool_head *pool, void *ptr)
 {
 	_HA_ATOMIC_DEC(&pool->used);
 	_HA_ATOMIC_DEC(&pool->allocated);
+	swrate_add(&pool->needed_avg, POOL_AVG_SAMPLES, pool->used);
 	pool_free_area(ptr, pool->size + POOL_EXTRA);
 }
 
diff --git a/src/pool.c b/src/pool.c
index 59cc5083e..685d6b300 100644
--- a/src/pool.c
+++ b/src/pool.c
@@ -165,6 +165,8 @@ void *__pool_refill_alloc(struct pool_head *pool, unsigned int avail)
 		return NULL;
 	}
 
+	swrate_add_scaled(&pool->needed_avg, POOL_AVG_SAMPLES, pool->allocated, POOL_AVG_SAMPLES/4);
+
 	ptr = pool_alloc_area(pool->size + POOL_EXTRA);
 	if (!ptr) {
 		_HA_ATOMIC_INC(&pool->failed);