diff --git a/master/ioctl.h b/master/ioctl.h
index 0bdae660..4e68f084 100644
--- a/master/ioctl.h
+++ b/master/ioctl.h
@@ -47,7 +47,7 @@
  *
  * Increment this when changing the ioctl interface!
  */
-#define EC_IOCTL_VERSION_MAGIC 32
+#define EC_IOCTL_VERSION_MAGIC 33
 
 // Command-line tool
 #define EC_IOCTL_MODULE                EC_IOR(0x00, ec_ioctl_module_t)