diff --git a/sdk/include/psdk/mmddk.h b/sdk/include/psdk/mmddk.h
index fdb46d1c32a..48e7fb9ca58 100644
--- a/sdk/include/psdk/mmddk.h
+++ b/sdk/include/psdk/mmddk.h
@@ -29,6 +29,10 @@
 #include <mmsystem.h>
 #include <winbase.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 /* Maxium drivers  */
 #define MAXWAVEDRIVERS 10
 
@@ -480,4 +484,8 @@ DWORD   WINAPI mmGetCurrentTask(void);
 
 #include <poppack.h>
 
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
 #endif /* __MMDDK_H */