diff --git a/src/Sound.cpp b/src/Sound.cpp
index 43be7281..1ea8e196 100644
--- a/src/Sound.cpp
+++ b/src/Sound.cpp
@@ -12,7 +12,6 @@ equivalents.
 
 #include "Sound.h"
 
-#include <stddef.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>