diff --git a/src/isolator/hei_isolation_chip.hpp b/src/isolator/hei_isolation_chip.hpp
index d4acddf..4fabea1 100644
--- a/src/isolator/hei_isolation_chip.hpp
+++ b/src/isolator/hei_isolation_chip.hpp
@@ -47,7 +47,7 @@
     const ChipType_t iv_chipType;
 
     /** Root nodes for this chip type. */
-    RootNodeMap iv_rootNodes;
+    std::map<AttentionType_t, const IsolationNodePtr> iv_rootNodes;
 
   public: // Member functions
     /**