diff --git a/data/json/mutations/mutations.json b/data/json/mutations/mutations.json
index 84f23be115f71..ba9efadbf5dde 100644
--- a/data/json/mutations/mutations.json
+++ b/data/json/mutations/mutations.json
@@ -360,7 +360,7 @@
     "points": 3,
     "description": "You have an exceptional memory, and find it easy to remember things.  Your skills will erode slightly slower than usual, and you can remember more terrain.",
     "map_memory_capacity_multiplier": 2,
-    "skill_rust_multiplier": 0.66,
+    "skill_rust_multiplier": 1.33,
     "starting_trait": true,
     "valid": false,
     "cancels": [ "FORGETFUL" ]
@@ -1050,7 +1050,7 @@
     "description": "You have a hard time remembering things.  Your skills will erode slightly faster than usual, and you can remember less terrain.",
     "social_modifiers": { "lie": -5 },
     "map_memory_capacity_multiplier": 0.5,
-    "skill_rust_multiplier": 1.33,
+    "skill_rust_multiplier": 0.66,
     "starting_trait": true,
     "category": [ "BEAST", "MEDICAL", "CHIMERA", "MOUSE", "INSECT" ],
     "cancels": [ "GOODMEMORY" ]