diff --git a/src/query/v2/request_router.hpp b/src/query/v2/request_router.hpp
index 74117f52e..aeaf5740a 100644
--- a/src/query/v2/request_router.hpp
+++ b/src/query/v2/request_router.hpp
@@ -128,9 +128,7 @@ class RequestRouterInterface {
   virtual bool IsPrimaryLabel(storage::v3::LabelId label) const = 0;
   virtual bool IsPrimaryKey(storage::v3::LabelId primary_label, storage::v3::PropertyId property) const = 0;
 
-  virtual std::optional<std::pair<uint64_t, uint64_t>> AllocateInitialEdgeIds(io::Address coordinator_address) {
-    return {};
-  }
+  virtual std::optional<std::pair<uint64_t, uint64_t>> AllocateInitialEdgeIds(io::Address coordinator_address) = 0;
 };
 
 // TODO(kostasrim)rename this class template
diff --git a/tests/unit/query_v2_expression_evaluator.cpp b/tests/unit/query_v2_expression_evaluator.cpp
index 5f77ed4e7..393952423 100644
--- a/tests/unit/query_v2_expression_evaluator.cpp
+++ b/tests/unit/query_v2_expression_evaluator.cpp
@@ -120,6 +120,10 @@ class MockedRequestRouter : public RequestRouterInterface {
 
   bool IsPrimaryKey(LabelId primary_label, PropertyId property) const override { return true; }
 
+  std::optional<std::pair<uint64_t, uint64_t>> AllocateInitialEdgeIds(io::Address coordinator_address) override {
+    return {};
+  }
+
  private:
   void SetUpNameIdMappers() {
     std::unordered_map<uint64_t, std::string> id_to_name;