diff --git a/java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java b/java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
index c7b51426f..7fbc05434 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/GesturePreviewTrail.java
@@ -285,7 +285,9 @@ final class GesturePreviewTrail {
             mEventTimes.setLength(newSize);
             mXCoordinates.setLength(newSize);
             mYCoordinates.setLength(newSize);
-            mPointTypes.setLength(newSize);
+            if (DBG_SHOW_POINTS) {
+                mPointTypes.setLength(newSize);
+            }
             // The start index of the last segment of the stroke
             // {@link mLastInterpolatedDrawIndex} should also be updated because all array
             // elements have just been shifted for compaction or been zeroed.