diff --git a/sys/fs/tmpfs/tmpfs_vnops.c b/sys/fs/tmpfs/tmpfs_vnops.c
index de686c796f5..866f4e209dc 100644
--- a/sys/fs/tmpfs/tmpfs_vnops.c
+++ b/sys/fs/tmpfs/tmpfs_vnops.c
@@ -1353,7 +1353,7 @@ tmpfs_pathconf(struct vop_pathconf_args *v)
 		break;
 
 	case _PC_FILESIZEBITS:
-		*retval = 0; /* XXX Don't know which value should I return. */
+		*retval = 64;
 		break;
 
 	default: