diff --git a/include/types/hlua.h b/include/types/hlua.h
index d05f59c..aada722 100644
--- a/include/types/hlua.h
+++ b/include/types/hlua.h
@@ -4,6 +4,9 @@
 #include <lua.h>
 
 #define CLASS_CORE     "Core"
+#define CLASS_TXN      "TXN"
+
+struct session;
 
 enum hlua_state {
 	HLUA_STOP = 0,
@@ -49,4 +52,15 @@
 	int function_ref;
 };
 
+/* This struct contains the pointer provided on the most
+ * of internal HAProxy calls during the processing of
+ * rules, converters and sample-fetches. This struct is
+ * associated with the lua object called "TXN".
+ */
+struct hlua_txn {
+	struct session *s;
+	struct proxy *p;
+	void *l7;
+};
+
 #endif /* _TYPES_HLUA_H */
diff --git a/include/types/session.h b/include/types/session.h
index 0fc2622..ad31ae2 100644
--- a/include/types/session.h
+++ b/include/types/session.h
@@ -34,6 +34,9 @@
 #include <types/channel.h>
 #include <types/compression.h>
 
+#ifdef USE_LUA
+#include <types/hlua.h>
+#endif
 #include <types/obj_type.h>
 #include <types/proto_http.h>
 #include <types/proxy.h>
@@ -160,6 +163,10 @@
 	/* These two pointers are used to resume the execution of the rule lists. */
 	struct list *current_rule_list;		/* this is used to store the current executed rule list. */
 	struct list *current_rule;		/* this is used to store the current rule to be resumed. */
+
+#ifdef USE_LUA
+	struct hlua hlua;			/* lua runtime context */
+#endif
 };
 
 #endif /* _TYPES_SESSION_H */