diff --git a/src/models/BKT/BKT-brain.js b/src/models/BKT/BKT-brain.js
index 8744fcf30a5..1132ee4e74d 100644
--- a/src/models/BKT/BKT-brain.js
+++ b/src/models/BKT/BKT-brain.js
@@ -1,6 +1,6 @@
 export default function update(model, isCorrect) {
-    let numerator, masteryAndGuess, probMasteryGivenObservation;
-
+    let numerator;
+    let masteryAndGuess;
     if (isCorrect) {
         numerator = model.probMastery * (1 - model.probSlip);
         masteryAndGuess = (1 - model.probMastery) * model.probGuess;
@@ -9,11 +9,6 @@ export default function update(model, isCorrect) {
         masteryAndGuess = (1 - model.probMastery) * (1 - model.probGuess);
     }
 
-    probMasteryGivenObservation = numerator / (numerator + masteryAndGuess);
-
-    let adjustment = (probMasteryGivenObservation - model.probMastery) * model.probTransit;
-
-    model.probMastery += adjustment;
-
-    model.probMastery = Math.max(0, Math.min(1, model.probMastery));
+    let probMasteryGivenObservation = numerator / (numerator + masteryAndGuess);
+    model.probMastery = probMasteryGivenObservation + ((1 - probMasteryGivenObservation) * model.probTransit);
 }