diff --git a/linux-user/ioctls.h b/linux-user/ioctls.h
index 3281c97ca2..cd9b6f9a8d 100644
--- a/linux-user/ioctls.h
+++ b/linux-user/ioctls.h
@@ -246,6 +246,9 @@
   IOCTL(RNDADDTOENTCNT, IOC_W, MK_PTR(TYPE_INT))
   IOCTL(RNDZAPENTCNT, 0, TYPE_NULL)
   IOCTL(RNDCLEARPOOL, 0, TYPE_NULL)
+#ifdef RNDRESEEDCRNG
+  IOCTL(RNDRESEEDCRNG, 0, TYPE_NULL)
+#endif
 
   IOCTL(CDROMPAUSE, 0, TYPE_NULL)
   IOCTL(CDROMSTART, 0, TYPE_NULL)
diff --git a/linux-user/syscall_defs.h b/linux-user/syscall_defs.h
index 0662270300..19a1d39cbc 100644
--- a/linux-user/syscall_defs.h
+++ b/linux-user/syscall_defs.h
@@ -850,6 +850,7 @@ struct target_pollfd {
 #define TARGET_RNDADDTOENTCNT  TARGET_IOW('R', 0x01, int)
 #define TARGET_RNDZAPENTCNT    TARGET_IO('R', 0x04)
 #define TARGET_RNDCLEARPOOL    TARGET_IO('R', 0x06)
+#define TARGET_RNDRESEEDCRNG   TARGET_IO('R', 0x07)
 
 /* From <linux/fs.h> */