diff --git a/include/hw/block/swim.h b/include/hw/block/swim.h
index c1bd5f6555..9b3dcb029d 100644
--- a/include/hw/block/swim.h
+++ b/include/hw/block/swim.h
@@ -11,6 +11,7 @@
 #ifndef SWIM_H
 #define SWIM_H
 
+#include "hw/block/block.h"
 #include "hw/sysbus.h"
 #include "qom/object.h"