diff --git a/pbs-tools/src/lru_cache.rs b/pbs-tools/src/lru_cache.rs
index b1c0c6ac..fbd7673a 100644
--- a/pbs-tools/src/lru_cache.rs
+++ b/pbs-tools/src/lru_cache.rs
@@ -100,9 +100,25 @@ pub struct LruCache<K, V> {
     _marker: PhantomData<Box<CacheNode<K, V>>>,
 }
 
+impl<K, V> Drop for LruCache<K, V> {
+    fn drop (&mut self) {
+        self.clear();
+    }
+}
+
 // trivial: if our contents are Send, the whole cache is Send
 unsafe impl<K: Send, V: Send> Send for LruCache<K, V> {}
 
+impl<K, V> LruCache<K, V> {
+    /// Clear all the entries from the cache.
+    pub fn clear(&mut self) {
+        // This frees only the HashMap with the node pointers.
+        self.map.clear();
+        // This frees the actual nodes and resets the list head and tail.
+        self.list.clear();
+    }
+}
+
 impl<K: std::cmp::Eq + std::hash::Hash + Copy, V> LruCache<K, V> {
     /// Create LRU cache instance which holds up to `capacity` nodes at once.
     pub fn new(capacity: usize) -> Self {
@@ -115,14 +131,6 @@ impl<K: std::cmp::Eq + std::hash::Hash + Copy, V> LruCache<K, V> {
         }
     }
 
-    /// Clear all the entries from the cache.
-    pub fn clear(&mut self) {
-        // This frees only the HashMap with the node pointers.
-        self.map.clear();
-        // This frees the actual nodes and resets the list head and tail.
-        self.list.clear();
-    }
-
     /// Insert or update an entry identified by `key` with the given `value`.
     /// This entry is placed as the most recently used node at the head.
     pub fn insert(&mut self, key: K, value: V) {