diff --git a/libguile/ioext.c b/libguile/ioext.c
index c3c4599b6..209f85d44 100644
--- a/libguile/ioext.c
+++ b/libguile/ioext.c
@@ -48,6 +48,7 @@
 #include "fports.h"
 #include "unif.h"
 #include "chars.h"
+#include "feature.h"
 
 #include "ioext.h"