diff --git a/plugins/LadspaEffect/swh/impulses/all.h b/plugins/LadspaEffect/swh/impulses/all.h
index 5ea04fc6a..b6f2c0346 100644
--- a/plugins/LadspaEffect/swh/impulses/all.h
+++ b/plugins/LadspaEffect/swh/impulses/all.h
@@ -2,6 +2,7 @@
 
 #define IMPULSES      21
 
+#include "lmmsconfig.h"
 #include "impulses/01-unit.h"
 #include "impulses/02-steves-flat.h"
 #include "impulses/03-stk-m1.h"