diff --git a/libs/hwui/SpotShadow.cpp b/libs/hwui/SpotShadow.cpp
index 7a2b9af2ba572..5d36a03c43c58 100644
--- a/libs/hwui/SpotShadow.cpp
+++ b/libs/hwui/SpotShadow.cpp
@@ -742,7 +742,7 @@ inline void genNewPenumbraAndPairWithUmbra(const Vector2* penumbra, int penumbra
             // vertex's location.
             int newPenumbraNumber = indexDelta - 1;
 
-            float accumulatedDeltaLength[newPenumbraNumber];
+            float accumulatedDeltaLength[indexDelta];
             float totalDeltaLength = 0;
 
             // To save time, cache the previous umbra vertex info outside the loop