diff --git a/sys/amd64/include/param.h b/sys/amd64/include/param.h
index 3c1f974b9fe3..2d9a6f32ddb9 100644
--- a/sys/amd64/include/param.h
+++ b/sys/amd64/include/param.h
@@ -136,7 +136,7 @@
  * the kern.maxbcache /boot/loader.conf variable.
  */
 #ifndef VM_BCACHE_SIZE_MAX
-#define	VM_BCACHE_SIZE_MAX	(400 * 1024 * 1024)
+#define	VM_BCACHE_SIZE_MAX	(1024 * 1024 * 1024)
 #endif
 
 /*