diff --git a/src/core/operations/Bombe.mjs b/src/core/operations/Bombe.mjs
index 9014fd3a..34a94e53 100644
--- a/src/core/operations/Bombe.mjs
+++ b/src/core/operations/Bombe.mjs
@@ -50,7 +50,7 @@ class Bombe extends Operation {
                 name: "4th (left-most, only some models) rotor",
                 type: "editableOption",
                 value: ROTORS_FOURTH,
-                defaultIndex: 10
+                defaultIndex: 0
             },
             {
                 name: "Reflector",