diff --git a/onnxruntime/core/providers/coreml/builders/impl/activation_op_builder.cc b/onnxruntime/core/providers/coreml/builders/impl/activation_op_builder.cc
index f15618f821..3ccf242bab 100644
--- a/onnxruntime/core/providers/coreml/builders/impl/activation_op_builder.cc
+++ b/onnxruntime/core/providers/coreml/builders/impl/activation_op_builder.cc
@@ -6,6 +6,7 @@
 #include "core/providers/coreml/builders/impl/builder_utils.h"
 #include "core/providers/coreml/builders/model_builder.h"
 #endif
+#include "core/common/narrow.h"
 #include "core/providers/common.h"
 #include "core/providers/coreml/builders/helper.h"
 #include "core/providers/coreml/builders/impl/base_op_builder.h"
@@ -51,7 +52,7 @@ Status AddPReluWeight(ModelBuilder& model_builder, const Node& node,
                       COREML_SPEC::ActivationPReLU& prelu) {
   // add slope initializer as alpha weight
   const auto& slope_tensor = *model_builder.GetInitializerTensors().at(node.InputDefs()[1]->Name());
-  const auto slope_tensor_num_elements = gsl::narrow<size_t>(Product(slope_tensor.dims()));
+  const auto slope_tensor_num_elements = narrow<size_t>(Product(slope_tensor.dims()));
   if (slope_tensor_num_elements != 1) {
     ORT_RETURN_IF_ERROR(CreateCoreMLWeight(*prelu.mutable_alpha(), slope_tensor));
   } else {