diff --git a/packages/SystemUI/src/com/android/systemui/glwallpaper/ImageProcessHelper.java b/packages/SystemUI/src/com/android/systemui/glwallpaper/ImageProcessHelper.java
index 477e7d7ebf72f..d1939d0fddb0b 100644
--- a/packages/SystemUI/src/com/android/systemui/glwallpaper/ImageProcessHelper.java
+++ b/packages/SystemUI/src/com/android/systemui/glwallpaper/ImageProcessHelper.java
@@ -85,7 +85,9 @@ class ImageProcessHelper {
             Bitmap bitmap = bitmaps[0];
             if (bitmap != null) {
                 int[] histogram = processHistogram(bitmap);
-                return computePercentile85(bitmap, histogram);
+                Float val = computePercentile85(bitmap, histogram);
+                bitmaps[0] = null;
+                return val;
             }
             Log.e(TAG, "Per85ComputeTask: Can't get bitmap");
             return DEFAULT_PER85;