diff --git a/src/swift.h b/src/swift.h
index 10cc8495fd7cec7daf757831bfe2f12d0cc9f1f6..17f7c5c7e4e56ed1650d6cdd078060244c67b643 100644
--- a/src/swift.h
+++ b/src/swift.h
@@ -32,6 +32,7 @@
 #include "common_io.h"
 #include "const.h"
 #include "cooling.h"
+#include "cooling_struct.h"
 #include "cosmology.h"
 #include "cycle.h"
 #include "debug.h"