diff --git a/src/channels1.c b/src/channels1.c
index 2d357222..9d63f2bf 100644
--- a/src/channels1.c
+++ b/src/channels1.c
@@ -22,6 +22,8 @@
  * MA 02111-1307, USA.
  */
 
+#include "config.h"
+
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>