diff --git a/libguile/vports.c b/libguile/vports.c
index be1fa2c52..e5bd33a25 100644
--- a/libguile/vports.c
+++ b/libguile/vports.c
@@ -41,6 +41,9 @@
 
 
 
+#if HAVE_CONFIG_H
+#  include <config.h>
+#endif
 
 #include <stdio.h>
 #include <errno.h>