diff --git a/src/swift.h b/src/swift.h
index 9c73567ab95876401c5eb20123b56f065ec372ac..323be34ed39f5232ff756dd888f13f237d1214b8 100644
--- a/src/swift.h
+++ b/src/swift.h
@@ -87,6 +87,7 @@
 #include "scheduler.h"
 #include "serial_io.h"
 #include "single_io.h"
+#include "sink_iact.h"
 #include "sink_properties.h"
 #include "space.h"
 #include "star_formation.h"