diff --git a/include/podio/detail/Association.h b/include/podio/detail/Association.h
index 381459e8f..b4db89831 100644
--- a/include/podio/detail/Association.h
+++ b/include/podio/detail/Association.h
@@ -211,6 +211,10 @@ class AssociationT {
     return m_obj == other.m_obj;
   }
 
+  bool operator!=(const AssociationT& other) const {
+    return !(*this == other);
+  }
+
   bool operator<(const AssociationT& other) const {
     return m_obj < other.m_obj;
   }