diff --git a/onnxruntime/core/session/inference_session.cc b/onnxruntime/core/session/inference_session.cc
index ad46a03e8fd75..39f47c09f2402 100644
--- a/onnxruntime/core/session/inference_session.cc
+++ b/onnxruntime/core/session/inference_session.cc
@@ -671,9 +671,7 @@ common::Status InferenceSession::RegisterExecutionProvider(const std::shared_ptr
 
   // Register the custom op domain only if it has not been registered before
   if (registry_kernels.empty()) {
-    for (auto candidate_custom_op_domain : candidate_custom_op_domains) {
-      custom_op_domains.push_back(candidate_custom_op_domain);
-    }
+    custom_op_domains = candidate_custom_op_domains;
   } else {
     for (auto candidate_custom_op_domain : candidate_custom_op_domains) {
       for (auto registry_kernel : registry_kernels) {