diff --git a/api/include/mk_common.h b/api/include/mk_common.h
index 90b4c8a6..b6f480cd 100755
--- a/api/include/mk_common.h
+++ b/api/include/mk_common.h
@@ -24,6 +24,10 @@
 #    define API_CALL
 #endif
 
+#ifndef _WIN32
+#define _strdup strdup
+#endif
+
 #if defined(_WIN32) && defined(_MSC_VER)
 #    if !defined(GENERATE_EXPORT)
 #        if defined(MediaKitApi_EXPORTS)
diff --git a/api/source/mk_events_objects.cpp b/api/source/mk_events_objects.cpp
index bcead9ed..758e38a3 100644
--- a/api/source/mk_events_objects.cpp
+++ b/api/source/mk_events_objects.cpp
@@ -25,10 +25,6 @@
 using namespace toolkit;
 using namespace mediakit;
 
-#ifndef _WIN32
-#define _strdup strdup
-#endif
-
 ///////////////////////////////////////////RecordInfo/////////////////////////////////////////////
 API_EXPORT uint64_t API_CALL mk_mp4_info_get_start_time(const mk_mp4_info ctx){
     assert(ctx);
diff --git a/api/source/mk_util.cpp b/api/source/mk_util.cpp
index 66d0d3b2..eda27162 100644
--- a/api/source/mk_util.cpp
+++ b/api/source/mk_util.cpp
@@ -21,10 +21,6 @@ using namespace std;
 using namespace toolkit;
 using namespace mediakit;
 
-#ifndef _WIN32
-#define _strdup strdup
-#endif
-
 API_EXPORT void API_CALL mk_free(void *ptr) {
     free(ptr);
 }