diff --git a/lib-src/portmixer/src/px_win_endpoint.h b/lib-src/portmixer/src/px_win_endpoint.h
index 39d82493e..b4bfb70ea 100644
--- a/lib-src/portmixer/src/px_win_endpoint.h
+++ b/lib-src/portmixer/src/px_win_endpoint.h
@@ -1,5 +1,5 @@
-#ifndef PX_WIN_COMMON_H
-#define PX_WIN_COMMON_H
+#ifndef PX_WIN_ENDPOINT_H
+#define PX_WIN_ENDPOINT_H
 /*
  * PortMixer
  * Windows Common Header for Vista/7