diff --git a/libc/kernel/uapi/linux/idxd.h b/libc/kernel/uapi/linux/idxd.h
index a456352..01c62f2 100644
--- a/libc/kernel/uapi/linux/idxd.h
+++ b/libc/kernel/uapi/linux/idxd.h
@@ -276,7 +276,7 @@
       uint32_t rsvd2 : 8;
     };
     uint32_t delta_rec_size;
-    uint32_t crc_val;
+    uint64_t crc_val;
     struct {
       uint32_t dif_chk_ref_tag;
       uint16_t dif_chk_app_tag_mask;