diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
index 15bfd6f3b4..fd562abd90 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessorGraph.cpp
@@ -1566,27 +1566,28 @@ class RenderSequenceSignature
 
 public:
     RenderSequenceSignature (const PrepareSettings s, const Nodes& n, const Connections& c)
-        : settings (s), connections (c), nodes (getNodeIDs (n)) {}
+        : settings (s), connections (c), nodes (getNodeMap (n)) {}
 
     bool operator== (const RenderSequenceSignature& other) const { return tie() == other.tie(); }
     bool operator!= (const RenderSequenceSignature& other) const { return tie() != other.tie(); }
 
 private:
-    static std::vector<AudioProcessorGraph::NodeID> getNodeIDs (const Nodes& n)
+    using NodeMap = std::map<AudioProcessorGraph::NodeID, AudioProcessor::BusesLayout>;
+
+    static NodeMap getNodeMap (const Nodes& n)
     {
         const auto& nodeRefs = n.getNodes();
-        std::vector<AudioProcessorGraph::NodeID> result;
-        result.reserve ((size_t) nodeRefs.size());
+        NodeMap result;
 
         for (const auto& node : nodeRefs)
-            result.push_back (node->nodeID);
+            result.emplace (node->nodeID, node->getProcessor()->getBusesLayout());
 
         return result;
     }
 
     PrepareSettings settings;
     Connections connections;
-    std::vector<AudioProcessorGraph::NodeID> nodes;
+    NodeMap nodes;
 };
 
 //==============================================================================