diff --git a/include/chat/common.h b/include/chat/common.h
index 63783ac..d6b0afe 100644
--- a/include/chat/common.h
+++ b/include/chat/common.h
@@ -7,7 +7,6 @@
 #include <string.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
-#include <why2/flags.h>
 #include <why2/misc.h>
 #include <why2/memory.h>
 #include <pthread.h>