diff --git a/sys/arm/include/param.h b/sys/arm/include/param.h
index 9ffb118..5c738c2 100644
--- a/sys/arm/include/param.h
+++ b/sys/arm/include/param.h
@@ -128,6 +128,11 @@
 #define USPACE_SVC_STACK_BOTTOM		(USPACE_SVC_STACK_TOP - 0x1000)
 #define USPACE_UNDEF_STACK_TOP		(USPACE_SVC_STACK_BOTTOM - 0x10)
 #define USPACE_UNDEF_STACK_BOTTOM	(FPCONTEXTSIZE + 10)
+
+#ifndef VM_BCACHE_SIZE_MAX
+#define	VM_BCACHE_SIZE_MAX	(128 * 1024 * 1024)
+#endif
+
 /*
  * Mach derived conversion macros
  */