diff --git a/mach/mach_init.c b/mach/mach_init.c
index a0d9f7f5e2..42b9cacf68 100644
--- a/mach/mach_init.c
+++ b/mach/mach_init.c
@@ -17,6 +17,7 @@
 
 #include <mach.h>
 #include <mach/mig_support.h>
+#include <mach/vm_param.h>
 #include <unistd.h>
 
 mach_port_t __mach_task_self_;
@@ -38,7 +39,10 @@ __mach_init (void)
   __mach_host_self_ = (__mach_host_self) ();
   __mig_init (0);
 
-#ifdef HAVE_HOST_PAGE_SIZE
+#ifdef PAGE_SIZE
+  __vm_page_size = PAGE_SIZE;
+  (void) err;
+#elif defined (HAVE_HOST_PAGE_SIZE)
   if (err = __host_page_size (__mach_host_self (), &__vm_page_size))
     _exit (err);
 #else