diff --git a/library/src/uk/co/senab/bitmapcache/CacheableBitmapDrawable.java b/library/src/uk/co/senab/bitmapcache/CacheableBitmapDrawable.java
index 8b0494b..ce63477 100644
--- a/library/src/uk/co/senab/bitmapcache/CacheableBitmapDrawable.java
+++ b/library/src/uk/co/senab/bitmapcache/CacheableBitmapDrawable.java
@@ -167,6 +167,13 @@ synchronized void setCached(boolean added) {
         checkState();
     }
 
+    /**
+     * Try to recycle if not referenced by cache or being displayed.
+     */
+    private void tryRecycle() {
+        checkState(false);
+    }
+
     private void cancelCheckStateCallback() {
         if (null != mCheckStateRunnable) {
             if (Constants.DEBUG) {