diff --git a/app/node/block/block.cpp b/app/node/block/block.cpp
index 69cda6126..a80c69bab 100644
--- a/app/node/block/block.cpp
+++ b/app/node/block/block.cpp
@@ -303,3 +303,13 @@ NodeInput *Block::speed_input() const
   return speed_input_;
 }
 
+void Block::InvalidateCache(const rational &start_range, const rational &end_range, NodeInput *from)
+{
+  // We ignore length changes since they don't have an effect on our frames
+  if (from == length_input_) {
+    return;
+  }
+
+  Node::InvalidateCache(start_range, end_range, from);
+}
+
diff --git a/app/node/block/block.h b/app/node/block/block.h
index cb9ea4e93..0bde06cf9 100644
--- a/app/node/block/block.h
+++ b/app/node/block/block.h
@@ -92,6 +92,8 @@ public:
   NodeInput* media_in_input() const;
   NodeInput* speed_input() const;
 
+  virtual void InvalidateCache(const rational& start_range, const rational& end_range, NodeInput* from = nullptr) override;
+
 public slots:
 
 signals: