diff --git a/app/node/math/merge/merge.cpp b/app/node/math/merge/merge.cpp
index d154aa8b2..e5c039a6e 100644
--- a/app/node/math/merge/merge.cpp
+++ b/app/node/math/merge/merge.cpp
@@ -82,4 +82,15 @@ NodeInput *MergeNode::blend_in() const
   return blend_in_;
 }
 
+void MergeNode::Hash(QCryptographicHash &hash, const rational &time) const
+{
+  if (base_in_->IsConnected()) {
+    base_in_->get_connected_node()->Hash(hash, time);
+  }
+
+  if (blend_in_->IsConnected()) {
+    blend_in_->get_connected_node()->Hash(hash, time);
+  }
+}
+
 OLIVE_NAMESPACE_EXIT
diff --git a/app/node/math/merge/merge.h b/app/node/math/merge/merge.h
index fda931a8e..63a17cb2d 100644
--- a/app/node/math/merge/merge.h
+++ b/app/node/math/merge/merge.h
@@ -45,6 +45,8 @@ public:
   NodeInput* base_in() const;
   NodeInput* blend_in() const;
 
+  virtual void Hash(QCryptographicHash &hash, const rational &time) const override;
+
 private:
   NodeInput* base_in_;