diff --git a/include/types/proxy.h b/include/types/proxy.h
index 432111b..1c73d24 100644
--- a/include/types/proxy.h
+++ b/include/types/proxy.h
@@ -121,6 +121,7 @@
 #define PR_O2_CLFLOG	0x00000400      /* log into clf format */
 #define PR_O2_LOGHCHKS	0x00000800	/* log health checks */
 #define PR_O2_INDEPSTR	0x00001000	/* independant streams, don't update rex on write */
+#define PR_O2_SOCKSTAT	0x00002000	/* collect & provide separate statistics for sockets */
 
 struct error_snapshot {
 	struct timeval when;		/* date of this event, (tv_sec == 0) means "never" */