diff --git a/src/BulHit.cpp b/src/BulHit.cpp
index e9524af0..50330203 100644
--- a/src/BulHit.cpp
+++ b/src/BulHit.cpp
@@ -2,6 +2,8 @@
 
 #include <stddef.h>
 
+#include "WindowsWrapper.h"
+
 #include "Bullet.h"
 #include "Caret.h"
 #include "Game.h"
diff --git a/src/Game.cpp b/src/Game.cpp
index f4eaa39f..553c5c64 100644
--- a/src/Game.cpp
+++ b/src/Game.cpp
@@ -2,7 +2,6 @@
 
 #include <stddef.h>
 #include <stdio.h>
-#include <stdlib.h>
 
 #include "WindowsWrapper.h"
 
diff --git a/src/PixTone.cpp b/src/PixTone.cpp
index efb28f4b..b069c2c0 100644
--- a/src/PixTone.cpp
+++ b/src/PixTone.cpp
@@ -1,7 +1,6 @@
 #include "PixTone.h"
 
 #include <math.h>
-#include <stdlib.h>
 #include <string.h>
 
 #include "WindowsWrapper.h"