diff --git a/onnxruntime/core/providers/coreml/builders/impl/split_op_builder.cc b/onnxruntime/core/providers/coreml/builders/impl/split_op_builder.cc
index 815f68128f..56c87c8831 100644
--- a/onnxruntime/core/providers/coreml/builders/impl/split_op_builder.cc
+++ b/onnxruntime/core/providers/coreml/builders/impl/split_op_builder.cc
@@ -139,8 +139,8 @@ bool SplitOpBuilder::IsOpSupportedImpl(const Node& node, const OpBuilderInputPar
     }
     const auto& splits_tensor = *initializers.at(input_defs[1]->Name());
     Initializer unpacked_tensor(splits_tensor);
-    auto splits_span = unpacked_tensor.DataAsSpan<uint64_t>();
-    int sum_of_splits = std::accumulate(splits_span.begin(), splits_span.end(), 0);
+    auto splits_span = unpacked_tensor.DataAsSpan<int64_t>();
+    int64_t sum_of_splits = std::accumulate(splits_span.begin(), splits_span.end(), int64_t{0});
     if (sum_of_splits != split_dims_at_axis) {
       LOGS(logger, VERBOSE) << "Mismatch between the sum of 'split'. Expected: "
                             << split_dims_at_axis