diff --git a/onnxruntime/test/providers/tensorrt/tensorrt_basic_test.cc b/onnxruntime/test/providers/tensorrt/tensorrt_basic_test.cc
index 3c5ac170e6a38..d9f917f6d187c 100644
--- a/onnxruntime/test/providers/tensorrt/tensorrt_basic_test.cc
+++ b/onnxruntime/test/providers/tensorrt/tensorrt_basic_test.cc
@@ -18,10 +18,6 @@ using namespace std;
 using namespace ONNX_NAMESPACE;
 using namespace ::onnxruntime::logging;
 
-// Once we use C++17 this could be replaced with std::size
-template <typename T, size_t N>
-constexpr size_t countof(T (&)[N]) { return N; }
-
 namespace onnxruntime {
 
 namespace test {