diff --git a/fs/bio.c b/fs/bio.c
index 3a1472a..ca8f7a8 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -52,7 +52,7 @@
  */
 
 #define BV(x) { .nr_vecs = x, .name = "biovec-"__stringify(x) }
-static struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] = {
+static struct biovec_slab bvec_slabs[BIOVEC_NR_POOLS] __read_mostly = {
 	BV(1), BV(4), BV(16), BV(64), BV(128), BV(BIO_MAX_PAGES),
 };
 #undef BV