diff --git a/third_party/mempool/mempool/ncx_slab.c b/third_party/mempool/mempool/ncx_slab.c
index ee87f74..57dcc34 100644
--- a/third_party/mempool/mempool/ncx_slab.c
+++ b/third_party/mempool/mempool/ncx_slab.c
@@ -60,6 +60,11 @@ static ncx_uint_t ncx_pagesize;
 static ncx_uint_t ncx_pagesize_shift;
 static ncx_uint_t ncx_real_pages;
 
+#ifdef __APPLE__
+#include <mach/mach.h>
+#include <mach/mach_host.h>
+#endif
+
 void ncx_slab_init(ncx_slab_pool_t* pool) {
     u_char* p;
     size_t size;
@@ -67,7 +72,13 @@ void ncx_slab_init(ncx_slab_pool_t* pool) {
     ncx_slab_page_t* slots;
 
     /*pagesize*/
+#ifdef __APPLE__
+    vm_size_t pagesize;
+    host_page_size(mach_host_self(), &pagesize);
+    ncx_pagesize = pagesize;
+#else
     ncx_pagesize = getpagesize();
+#endif
     for (n = ncx_pagesize, ncx_pagesize_shift = 0;
          n >>= 1; ncx_pagesize_shift++) {
         /* void */
@@ -669,7 +680,13 @@ static void ncx_slab_free_pages(ncx_slab_pool_t* pool, ncx_slab_page_t* page,
 void ncx_slab_dummy_init(ncx_slab_pool_t* pool) {
     ncx_uint_t n;
 
+#ifdef __APPLE__
+    vm_size_t pagesize;
+    host_page_size(mach_host_self(), &pagesize);
+    ncx_pagesize = pagesize;
+#else
     ncx_pagesize = getpagesize();
+#endif
     for (n = ncx_pagesize, ncx_pagesize_shift = 0;
          n >>= 1; ncx_pagesize_shift++) {
         /* void */