diff --git a/java/src/main/native/ai_onnxruntime_OrtSession_SessionOptions.c b/java/src/main/native/ai_onnxruntime_OrtSession_SessionOptions.c
index 3a1c0d1bb8fa1..4a5e2b7ef3b1e 100644
--- a/java/src/main/native/ai_onnxruntime_OrtSession_SessionOptions.c
+++ b/java/src/main/native/ai_onnxruntime_OrtSession_SessionOptions.c
@@ -8,7 +8,7 @@
 #include "onnxruntime/core/session/onnxruntime_c_api.h"
 #include "OrtJniUtil.h"
 #include "ai_onnxruntime_OrtSession_SessionOptions.h"
-#ifdef WIN32
+#ifdef _WIN32
 #include <Windows.h>
 #else
 #include <dlfcn.h>
@@ -318,7 +318,7 @@ JNIEXPORT void JNICALL Java_ai_onnxruntime_OrtSession_00024SessionOptions_closeC
 
   // Iterate the handles, calling the appropriate close function
   for (jint i = 0; i < numHandles; i++) {
-#ifdef WIN32
+#ifdef _WIN32
     FreeLibrary((void*)handles[i]);
 #else
     dlclose((void*)handles[i]);
diff --git a/onnxruntime/core/mlas/lib/amx_common.h b/onnxruntime/core/mlas/lib/amx_common.h
index 3eb0700932faa..caf94af02362d 100644
--- a/onnxruntime/core/mlas/lib/amx_common.h
+++ b/onnxruntime/core/mlas/lib/amx_common.h
@@ -18,7 +18,7 @@ Module Name:
 
 #include "mlasi.h"
 
-#ifdef WIN32
+#ifdef _WIN32
 #define tile_dpbssd(dst, src1, src2) _tile_dpbssd(dst, src1, src2)
 
 #define tile_dpbsud(dst, src1, src2) _tile_dpbsud(dst, src1, src2)