diff --git a/src/core/ngx_palloc.c b/src/core/ngx_palloc.c
index d3044ac9c..016dc3f78 100644
--- a/src/core/ngx_palloc.c
+++ b/src/core/ngx_palloc.c
@@ -160,7 +160,7 @@ ngx_palloc_small(ngx_pool_t *pool, size_t size, ngx_uint_t align)
             m = ngx_align_ptr(m, NGX_ALIGNMENT);
         }
 
-        if ((size_t) (p->d.end - m) >= size) {
+        if (p->d.end - size >= m) {
             p->d.last = m + size;
 
             return m;