diff --git a/src/client/libdistren_config.c b/src/client/libdistren_config.c
--- a/src/client/libdistren_config.c
+++ b/src/client/libdistren_config.c
@@ -21,6 +21,8 @@
   Functions and code for retrieving the client's configuration information.
  */
 
+#include "common/config.h"
+
 #include "client/libdistren.h"
 #include "common/options.h"