diff --git a/include/chat/common.h b/include/chat/common.h
index 9d4e756..63783ac 100644
--- a/include/chat/common.h
+++ b/include/chat/common.h
@@ -10,6 +10,7 @@
 #include <why2/flags.h>
 #include <why2/misc.h>
 #include <why2/memory.h>
+#include <pthread.h>
 
 //DEFINES
 #define SA struct sockaddr