diff --git a/Control/AthenaKernel/AthenaKernel/ExtendedEventContext.h b/Control/AthenaKernel/AthenaKernel/ExtendedEventContext.h
index 5736513f9c696f5685af27dca2fc974a52eb93c9..ad0ad227204250549e1a990bd4e230fb60c469b2 100644
--- a/Control/AthenaKernel/AthenaKernel/ExtendedEventContext.h
+++ b/Control/AthenaKernel/AthenaKernel/ExtendedEventContext.h
@@ -78,7 +78,7 @@ namespace Atlas {
     EventIDBase::number_type m_conditionsRun {EventIDBase::UNDEFNUM};
     const TrigRoiDescriptor* m_roi {nullptr};
     const SG::ThinningCache* m_thinningCache {nullptr};
-    std::pmr::memory_resource* m_memResource;
+    std::pmr::memory_resource* m_memResource{nullptr};
   };