diff --git a/libc/kernel/uapi/linux/random.h b/libc/kernel/uapi/linux/random.h
index d1fd998..64f62d9 100644
--- a/libc/kernel/uapi/linux/random.h
+++ b/libc/kernel/uapi/linux/random.h
@@ -24,4 +24,10 @@
 #define GRND_NONBLOCK 0x0001
 #define GRND_RANDOM 0x0002
 #define GRND_INSECURE 0x0004
+struct vgetrandom_opaque_params {
+  __u32 size_of_opaque_state;
+  __u32 mmap_prot;
+  __u32 mmap_flags;
+  __u32 reserved[13];
+};
 #endif