--- a/src/animation.c
+++ b/src/animation.c
@@ -5,6 +5,7 @@
 #include <stdlib.h>
 #include <minigui/common.h>
 #include <minigui/gdi.h>
+#include <minigui/minigui.h>
 #include <minigui/window.h>
 
 #include "mgeff.h"
--- a/src/schedular.c
+++ b/src/schedular.c
@@ -11,6 +11,7 @@
 
 #include <minigui/common.h>
 #include <minigui/gdi.h>
+#include <minigui/minigui.h>
 #include <minigui/window.h>
 
 #include "mgeff.h"
--- a/src/window-animation.c
+++ b/src/window-animation.c
@@ -15,6 +15,7 @@
 
 #include <minigui/common.h>
 #include <minigui/gdi.h>
+#include <minigui/minigui.h>
 #include <minigui/window.h>
 
 #include "mgeff.h"