diff --git a/src/boards/__serial.c b/src/boards/__serial.c
index 09c858f..745a890 100644
--- a/src/boards/__serial.c
+++ b/src/boards/__serial.c
@@ -1,6 +1,6 @@
 #include "__serial.h"
 
-#if defined(_WIN32) && !defined(_XBOX)
+#if defined(_WIN32) && !defined(_XBOX) && !defined(__LIBRETRO__)
 
 HANDLE SerialPort = NULL;	// Handle of SerialPort itself.