diff --git a/src/ngraph/op/topk.hpp b/src/ngraph/op/topk.hpp
index 2327344ab6e5c9d3e6fdd5722c0cec3431e272a1..9fc9f5be87336541d9366126336dfe50dfa562d8 100644
--- a/src/ngraph/op/topk.hpp
+++ b/src/ngraph/op/topk.hpp
@@ -90,7 +90,7 @@ namespace ngraph
             size_t m_top_k_axis{0};
             element::Type m_index_element_type;
             bool m_compute_max{false};
-            SortType m_sort;
+            SortType m_sort{SortType::NONE};
             virtual void generate_adjoints(autodiff::Adjoints& adjoints,
                                            const NodeVector& deltas) override;
         };