diff --git a/hw/dmx/config/dmxcompat.c b/hw/dmx/config/dmxcompat.c
index 98c52eb0e..1c72084fa 100644
--- a/hw/dmx/config/dmxcompat.c
+++ b/hw/dmx/config/dmxcompat.c
@@ -42,6 +42,7 @@
 #include <dmx-config.h>
 #endif
 
+#include "os.h"
 #include "dmxconfig.h"
 #include "dmxparse.h"
 #include "dmxcompat.h"