diff --git a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/OverlayNode.kt b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/OverlayNode.kt
index cd6a91b45a..6365abfe51 100644
--- a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/OverlayNode.kt
+++ b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/OverlayNode.kt
@@ -29,4 +29,7 @@ package de.fraunhofer.aisec.cpg.graph
  * Represents an extra node added to the CPG. These nodes can live next to the CPG, typically having
  * shared edges to extend the original CPG graph.
  */
-abstract class OverlayNode : Node()
+abstract class OverlayNode : Node() {
+    /** All [OverlayNode]s nodes are connected to an original cpg [Node] by this. */
+    abstract val underlayingNode: Node
+}
diff --git a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Concept.kt b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Concept.kt
index d676a3c837..dad9976f81 100644
--- a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Concept.kt
+++ b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Concept.kt
@@ -25,7 +25,6 @@
  */
 package de.fraunhofer.aisec.cpg.graph.concepts
 
-import de.fraunhofer.aisec.cpg.graph.Node
 import de.fraunhofer.aisec.cpg.graph.OverlayNode
 
 /**
@@ -34,8 +33,6 @@ import de.fraunhofer.aisec.cpg.graph.OverlayNode
  * and stored in [ops].
  */
 abstract class Concept() : OverlayNode() {
-    /** All concept nodes are connected to an original cpg [Node] by this. */
-    abstract val cpgNode: Node
     /** All [Operation]s belonging to this concept. */
     abstract val ops: Set<Operation>
 }
diff --git a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Operation.kt b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Operation.kt
index 9fa747e3dd..3944ef4dc4 100644
--- a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Operation.kt
+++ b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/graph/concepts/Operation.kt
@@ -25,7 +25,6 @@
  */
 package de.fraunhofer.aisec.cpg.graph.concepts
 
-import de.fraunhofer.aisec.cpg.graph.Node
 import de.fraunhofer.aisec.cpg.graph.OverlayNode
 
 /**
@@ -33,8 +32,6 @@ import de.fraunhofer.aisec.cpg.graph.OverlayNode
  * `write` on a file or log object or an `execute` on a database.
  */
 abstract class Operation : OverlayNode() {
-    /** All concept nodes are connected to an original cpg [Node] by this. */
-    abstract val cpgNode: Node
     /** The [Concept] this operation belongs to. */
     abstract val concept: Concept
 }