diff --git a/src/robotwar/register.clj b/src/robotwar/register.clj
index 434751d..1c7b7e1 100644
--- a/src/robotwar/register.clj
+++ b/src/robotwar/register.clj
@@ -102,7 +102,7 @@
   SHOT and DATA, respectively. In themselves, they're only storage registers.
   Likewise, SPEEDX and SPEEDY are used later in step-robot to determine
   the appropriate acceleration, which may have to applied over several ticks."
-  [robot-idx attributes]
+  [robot-idx]
   (let [storage-registers (for [reg-name storage-reg-names]
                             {reg-name (->StorageRegister robot-idx reg-name 0)})
         faux-storage-registers (for [reg-name ["AIM" "INDEX" "SPEEDX" "SPEEDY"]]
diff --git a/src/robotwar/robot.clj b/src/robotwar/robot.clj
index 900a192..f4c26f6 100644
--- a/src/robotwar/robot.clj
+++ b/src/robotwar/robot.clj
@@ -62,7 +62,7 @@
    :v-x 0
    :v-y 0
    :damage (:damage attributes)
-   :registers (register/init-registers idx attributes)
+   :registers (register/init-registers idx)
    :brain (brain/init-brain src-code register/reg-names)})
 
 (defn step-robot