diff --git a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/ControlFlowSensitiveDFGPass.kt b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/ControlFlowSensitiveDFGPass.kt
index 8c31f640373..239392b2cdc 100644
--- a/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/ControlFlowSensitiveDFGPass.kt
+++ b/cpg-core/src/main/kotlin/de/fraunhofer/aisec/cpg/passes/ControlFlowSensitiveDFGPass.kt
@@ -116,7 +116,7 @@ open class ControlFlowSensitiveDFGPass(ctx: TranslationContext) : TranslationUni
      * It further determines unnecessary implicit return statement which are added by some frontends
      * even if every path reaching this point already contains a return statement.
      */
-    protected fun transfer(
+    protected open fun transfer(
         currentEdge: PropertyEdge<Node>,
         state: State<Node, Set<Node>>,
         worklist: Worklist<PropertyEdge<Node>, Node, Set<Node>>
diff --git a/cpg-language-cxx/src/main/kotlin/de/fraunhofer/aisec/cpg/frontends/cxx/CXXLanguageFrontend.kt b/cpg-language-cxx/src/main/kotlin/de/fraunhofer/aisec/cpg/frontends/cxx/CXXLanguageFrontend.kt
index 27e8dcee9f8..6cadd017891 100644
--- a/cpg-language-cxx/src/main/kotlin/de/fraunhofer/aisec/cpg/frontends/cxx/CXXLanguageFrontend.kt
+++ b/cpg-language-cxx/src/main/kotlin/de/fraunhofer/aisec/cpg/frontends/cxx/CXXLanguageFrontend.kt
@@ -80,7 +80,7 @@ import org.slf4j.LoggerFactory
  */
 @RegisterExtraPass(DynamicInvokeResolver::class)
 @RegisterExtraPass(CXXExtraPass::class)
-class CXXLanguageFrontend(language: Language<CXXLanguageFrontend>, ctx: TranslationContext) :
+open class CXXLanguageFrontend(language: Language<CXXLanguageFrontend>, ctx: TranslationContext) :
     LanguageFrontend<IASTNode, IASTTypeId>(language, ctx) {
 
     /**