diff --git a/libguile/async.c b/libguile/async.c
index 38e5ca22f..85e2554b9 100644
--- a/libguile/async.c
+++ b/libguile/async.c
@@ -41,6 +41,9 @@
 
 
 
+#if HAVE_CONFIG_H
+#  include <config.h>
+#endif
 
 #include <signal.h>
 #include "libguile/_scm.h"