diff --git a/rtemsbsd/include/rtems/bsd/bsd.h b/rtemsbsd/include/rtems/bsd/bsd.h
index 8ab0fdaf..1583dc9e 100644
--- a/rtemsbsd/include/rtems/bsd/bsd.h
+++ b/rtemsbsd/include/rtems/bsd/bsd.h
@@ -111,6 +111,13 @@ typedef enum {
 	RTEMS_BSD_ALLOCATOR_DOMAIN_MALLOC
 } rtems_bsd_allocator_domain;
 
+/**
+ * @brief The size for the page/mbufs default allocator domain.
+ *
+ * Applications may set this value to change the value returned by the default.
+ */
+extern uintptr_t rtems_bsd_allocator_domain_page_mbuf_size;
+
 /**
  * @brief Returns the size for a specific allocator domain.
  *
diff --git a/rtemsbsd/rtems/rtems-bsd-get-allocator-domain-size.c b/rtemsbsd/rtems/rtems-bsd-get-allocator-domain-size.c
index 6471911a..a52ee50d 100644
--- a/rtemsbsd/rtems/rtems-bsd-get-allocator-domain-size.c
+++ b/rtemsbsd/rtems/rtems-bsd-get-allocator-domain-size.c
@@ -39,6 +39,8 @@
 
 #include <rtems/bsd/bsd.h>
 
+uintptr_t rtems_bsd_allocator_domain_page_mbuf_size = 8 * 1024 * 1024;
+
 uintptr_t
 rtems_bsd_get_allocator_domain_size(rtems_bsd_allocator_domain domain)
 {
@@ -47,7 +49,7 @@ rtems_bsd_get_allocator_domain_size(rtems_bsd_allocator_domain domain)
 	switch (domain) {
 		case RTEMS_BSD_ALLOCATOR_DOMAIN_PAGE:
 		case RTEMS_BSD_ALLOCATOR_DOMAIN_MBUF:
-			size = 8 * 1024 * 1024;
+			size = rtems_bsd_allocator_domain_page_mbuf_size;
 			break;
 		default:
 			size = 0;