diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index ba9a58c814..20265798cd 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -880,8 +880,8 @@ struct target_pollfd {
 #define TARGET_BLKSECTGET TARGET_IO(0x12,103)/* get max sectors per request (ll_rw_blk.c) */
 #define TARGET_BLKSSZGET  TARGET_IO(0x12,104)/* get block device sector size */
 /* A jump here: 108-111 have been used for various private purposes. */
-#define TARGET_BLKBSZGET  TARGET_IOR(0x12,112,int)
-#define TARGET_BLKBSZSET  TARGET_IOW(0x12,113,int)
+#define TARGET_BLKBSZGET  TARGET_IOR(0x12, 112, abi_ulong)
+#define TARGET_BLKBSZSET  TARGET_IOW(0x12, 113, abi_ulong)
 #define TARGET_BLKGETSIZE64 TARGET_IOR(0x12,114,abi_ulong)
                                              /* return device size in bytes
                                                 (u64 *arg) */