diff --git a/doc/configuration.txt b/doc/configuration.txt
index fb2f48d..f2275f7 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -5055,7 +5055,9 @@
                item specified here, the size of each entry will be inflated so
                that the additional data can fit. At the moment, only "conn_cum"
                is supported, which can be used to store and retrieve the total
-               number of connections matching the entry since it was created.
+               number of connections matching the entry since it was created. A
+               "server_id" type is also supported but it's only for internal
+               use for stick and store directives.
 
   The is only one stick-table per backend. At the moment of writing this doc,
   it does not seem useful to have multiple tables per backend. If this happens
diff --git a/include/types/stick_table.h b/include/types/stick_table.h
index 3e27b8f..843f5d7 100644
--- a/include/types/stick_table.h
+++ b/include/types/stick_table.h
@@ -41,6 +41,7 @@
 
 /* The types of extra data we can store in a stick table */
 enum {
+	STKTABLE_DT_SERVER_ID,    /* the server ID to use with this session if > 0 */
 	STKTABLE_DT_CONN_CUM,     /* cumulated number of connections */
 	STKTABLE_DATA_TYPES       /* Number of data types, must always be last */
 };
@@ -48,6 +49,7 @@
 /* stick_table extra data. This is mainly used for casting or size computation */
 union stktable_data {
 	unsigned int conn_cum;
+	int server_id;
 };
 
 /* known data types */
@@ -72,7 +74,6 @@
  * keys and variable-sized data without making use of intermediate pointers.
  */
 struct stksess {
-	int sid;                  /* id of server to use for this session */
 	unsigned int expire;      /* session expiration date */
 	struct eb32_node exp;     /* ebtree node used to hold the session in expiration tree */
 	struct ebmb_node key;     /* ebtree node used to hold the session in table */
diff --git a/src/cfgparse.c b/src/cfgparse.c
index 26c8ba7..d472f99 100644
--- a/src/cfgparse.c
+++ b/src/cfgparse.c
@@ -4899,6 +4899,7 @@
 			else {
 				free((void *)mrule->table.name);
 				mrule->table.t = &(target->table);
+				stktable_alloc_data_type(&target->table, STKTABLE_DT_SERVER_ID);
 			}
 		}
 
@@ -4931,6 +4932,7 @@
 			else {
 				free((void *)mrule->table.name);
 				mrule->table.t = &(target->table);
+				stktable_alloc_data_type(&target->table, STKTABLE_DT_SERVER_ID);
 			}
 		}
 
diff --git a/src/session.c b/src/session.c
index 873201c..2ae6f90 100644
--- a/src/session.c
+++ b/src/session.c
@@ -945,9 +945,11 @@
 				if ((ts = stktable_lookup_key(rule->table.t, key)) != NULL) {
 					if (!(s->flags & SN_ASSIGNED)) {
 						struct eb32_node *node;
+						void *ptr;
 
 						/* srv found in table */
-						node = eb32_lookup(&px->conf.used_server_id, ts->sid);
+						ptr = stktable_data_ptr(rule->table.t, ts, STKTABLE_DT_SERVER_ID);
+						node = eb32_lookup(&px->conf.used_server_id, stktable_data_cast(ptr, server_id));
 						if (node) {
 							struct server *srv;
 
@@ -1050,6 +1052,7 @@
 	/* process store request and store response */
 	for (i = 0; i < s->store_count; i++) {
 		struct stksess *ts;
+		void *ptr;
 
 		ts = stktable_lookup(s->store[i].table, s->store[i].ts);
 		if (ts) {
@@ -1060,7 +1063,8 @@
 			ts = stktable_store(s->store[i].table, s->store[i].ts);
 
 		s->store[i].ts = NULL;
-		ts->sid = s->srv->puid;
+		ptr = stktable_data_ptr(s->store[i].table, ts, STKTABLE_DT_SERVER_ID);
+		stktable_data_cast(ptr, server_id) = s->srv->puid;
 	}
 
 	rep->analysers &= ~an_bit;
diff --git a/src/stick_table.c b/src/stick_table.c
index 994fbeb..017362f 100644
--- a/src/stick_table.c
+++ b/src/stick_table.c
@@ -64,7 +64,6 @@
 static struct stksess *stksess_init(struct stktable *t, struct stksess * ts)
 {
 	memset((void *)ts - t->data_size, 0, t->data_size);
-	ts->sid = 0;
 	ts->key.node.leaf_p = NULL;
 	ts->exp.node.leaf_p = NULL;
 	return ts;
@@ -476,6 +475,7 @@
 /* Extra data types processing */
 struct stktable_data_type stktable_data_types[STKTABLE_DATA_TYPES] = {
 	[STKTABLE_DT_CONN_CUM] = { .name = "conn_cum", .data_length = stktable_data_size(conn_cum) },
+	[STKTABLE_DT_SERVER_ID] = { .name = "server_id", .data_length = stktable_data_size(server_id) },
 };
 
 /*