diff --git a/libc/kernel/uapi/linux/ion.h b/libc/kernel/uapi/linux/ion.h
index 7b5b031..7c9e6d7 100644
--- a/libc/kernel/uapi/linux/ion.h
+++ b/libc/kernel/uapi/linux/ion.h
@@ -20,7 +20,6 @@
 #define _UAPI_LINUX_ION_H
 #include <linux/ioctl.h>
 #include <linux/types.h>
-typedef int ion_user_handle_t;
 enum ion_heap_type {
   ION_HEAP_TYPE_SYSTEM,
   ION_HEAP_TYPE_SYSTEM_CONTIG,
@@ -31,24 +30,12 @@
 };
 #define ION_NUM_HEAP_IDS (sizeof(unsigned int) * 8)
 #define ION_FLAG_CACHED 1
-#define ION_FLAG_CACHED_NEEDS_SYNC 2
 struct ion_allocation_data {
-  size_t len;
-  size_t align;
-  unsigned int heap_id_mask;
-  unsigned int flags;
-  ion_user_handle_t handle;
-};
-struct ion_fd_data {
-  ion_user_handle_t handle;
-  int fd;
-};
-struct ion_handle_data {
-  ion_user_handle_t handle;
-};
-struct ion_custom_data {
-  unsigned int cmd;
-  unsigned long arg;
+  __u64 len;
+  __u32 heap_id_mask;
+  __u32 flags;
+  __u32 fd;
+  __u32 unused;
 };
 #define MAX_HEAP_NAME 32
 struct ion_heap_data {
@@ -68,11 +55,5 @@
 };
 #define ION_IOC_MAGIC 'I'
 #define ION_IOC_ALLOC _IOWR(ION_IOC_MAGIC, 0, struct ion_allocation_data)
-#define ION_IOC_FREE _IOWR(ION_IOC_MAGIC, 1, struct ion_handle_data)
-#define ION_IOC_MAP _IOWR(ION_IOC_MAGIC, 2, struct ion_fd_data)
-#define ION_IOC_SHARE _IOWR(ION_IOC_MAGIC, 4, struct ion_fd_data)
-#define ION_IOC_IMPORT _IOWR(ION_IOC_MAGIC, 5, struct ion_fd_data)
-#define ION_IOC_SYNC _IOWR(ION_IOC_MAGIC, 7, struct ion_fd_data)
-#define ION_IOC_CUSTOM _IOWR(ION_IOC_MAGIC, 6, struct ion_custom_data)
 #define ION_IOC_HEAP_QUERY _IOWR(ION_IOC_MAGIC, 8, struct ion_heap_query)
 #endif