diff --git a/winml/lib/Api/HardwareCoreEnumerator.cpp b/winml/lib/Api/HardwareCoreEnumerator.cpp
index b6b44690f4..d04e276347 100644
--- a/winml/lib/Api/HardwareCoreEnumerator.cpp
+++ b/winml/lib/Api/HardwareCoreEnumerator.cpp
@@ -84,7 +84,7 @@ uint32_t HardwareCoreEnumerator::DefaultIntraOpNumThreads() {
   // # of logical cores = # of P cores x 2 (if hyper threading is enabled) + # of E cores + # of Soc Cores.
   auto cores = GetNumberOPhysicalAndEngineeringCores();
 
-#if !defined(_M_ARM64) && !defined(__aarch64__)
+#if !defined(_M_ARM64EC) && !defined(_M_ARM64) && !defined(__aarch64__)
   const int kVendorID_Intel[3] = {0x756e6547, 0x6c65746e, 0x49656e69};  // "GenuntelineI"
   int regs_leaf0[4];
   int regs_leaf7[4];