diff --git a/include/common/appsession.h b/include/common/appsession.h
index 2c39e46..eb9ba2d 100644
--- a/include/common/appsession.h
+++ b/include/common/appsession.h
@@ -7,6 +7,7 @@
 #include <sys/time.h>
 
 #include <common/chtbl.h>
+#include <common/config.h>
 #include <common/hashpjw.h>
 #include <common/list.h>