diff --git a/ships/alliance_chieftain.json b/ships/alliance_chieftain.json
index 1fa3948..756e517 100644
--- a/ships/alliance_chieftain.json
+++ b/ships/alliance_chieftain.json
@@ -13,7 +13,7 @@
       "baseShieldStrength": 154,
       "baseArmour": 280,
       "hardness": 65,
-      "hullMass": 420,
+      "hullMass": 400,
       "masslock": 13,
       "pipSpeed": 0.03875,
       "pitch": 39,
@@ -35,7 +35,7 @@
     "slots": {
       "standard": [6, 6, 5, 5, 6, 4, 4],
       "hardpoints": [3, 3, 2, 1, 1, 1, 0, 0, 0, 0],
-      "internal": [5, 5, 4, 2, 2,
+      "internal": [6, 5, 4, 2, 2,
         { "class": 4, "name": "Military", "eligible": { "hr": 1, "scb": 1, "mrp": 1 } },
         { "class": 4, "name": "Military", "eligible": { "hr": 1, "scb": 1, "mrp": 1 } },
         { "class": 4, "name": "Military", "eligible": { "hr": 1, "scb": 1, "mrp": 1 } }
@@ -44,7 +44,7 @@
     "defaults": {
       "standard": ["6E", "6E", "5E", "5E", "6E", "4E", "4C"],
       "hardpoints": [17, 0, 17, 0, 0, 0, 0, 0, 0, 0, 0],
-      "internal": ["03", "4e", "02", "", "2h"]
+      "internal": ["04", "4e", "02", "", "2h"]
     }
   }
 }