diff --git a/doc/SPOE.txt b/doc/SPOE.txt
index 961d32a..7ce2bef 100644
--- a/doc/SPOE.txt
+++ b/doc/SPOE.txt
@@ -172,8 +172,10 @@
     - [no] option pipelining
     - [no] option send-frag-payload
     - option continue-on-error
+    - option force-set-var
     - option set-on-error
     - option var-prefix
+    - register-var-names
     - timeout hello|idle|processing
     - use-backend
 
@@ -321,8 +323,24 @@
 
   By default, an agent will never set new variables at runtime: It can only set
   new value for existing ones. If you want a different behaviour, see
-  force-set-var option
+  force-set-var option and register-var-names directive.
 
+register-var-names <var name> ...
+  Register some variable names. By default, an agent will not be allowed to set
+  new variables at runtime. This rule can be totally relaxed by setting the
+  option "force-set-var". If you know all the variables you will need, this
+  directive is a good way to register them without letting an agent doing what
+  it want. This is only required if these variables are not referenced anywhere
+  in the HAProxy configuration or the SPOE one.
+
+  Arguments:
+    <var name>   is a variable name without the scope. The name may only
+                 contain characters 'a-z', 'A-Z', '0-9', '.' and '_'.
+
+  The prefix will be automatically added during the registration. You can have
+  many "register-var-names" lines.
+
+  See also: "option force-set-var", "option var-prefix".
 
 timeout hello <timeout>
   Set the maximum time to wait for an agent to receive the AGENT-HELLO frame.
@@ -391,7 +409,6 @@
 
 
 acl <aclname> <criterion> [flags] [operator] <value> ...
-
   Declare or complete an access list.
 
   See section 7 about ACL usage in the HAProxy Configuration Manual.
diff --git a/include/types/spoe.h b/include/types/spoe.h
index 392cc94..2632601 100644
--- a/include/types/spoe.h
+++ b/include/types/spoe.h
@@ -177,6 +177,13 @@
 	struct list list;  /* Use to chain SPOE placeholders */
 };
 
+/* Used during the config parsing, when SPOE agent section is parsed, to
+ * register some variable names. */
+struct spoe_var_placeholder {
+	char        *name;  /* The variable name */
+	struct list  list;  /* Use to chain SPOE var placeholders */
+};
+
 /* Describe a message that will be sent in a NOTIFY frame. A message has a name,
  * an argument list (see above) and it is linked to a specific event. */
 struct spoe_message {
diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index 1b69ee2..e70cf11 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -87,6 +87,7 @@
 struct list curgrps;
 struct list curmphs;
 struct list curgphs;
+struct list curvars;
 
 /* Pools used to allocate SPOE structs */
 static struct pool_head *pool_head_spoe_ctx = NULL;
@@ -3483,6 +3484,33 @@
 			goto out;
 		}
 	}
+	else if (!strcmp(args[0], "register-var-names")) {
+		int   cur_arg;
+
+		if (!*args[1]) {
+			ha_alert("parsing [%s:%d] : '%s' expects one or more variable names.\n",
+				 file, linenum, args[0]);
+                        err_code |= ERR_ALERT | ERR_FATAL;
+                        goto out;
+                }
+		cur_arg = 1;
+		while (*args[cur_arg]) {
+			struct spoe_var_placeholder *vph;
+
+			if ((vph = calloc(1, sizeof(*vph))) == NULL) {
+				ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
+				err_code |= ERR_ALERT | ERR_ABORT;
+				goto out;
+			}
+			if ((vph->name  = strdup(args[cur_arg])) == NULL) {
+				ha_alert("parsing [%s:%d] : out of memory.\n", file, linenum);
+				err_code |= ERR_ALERT | ERR_ABORT;
+				goto out;
+			}
+			LIST_ADDQ(&curvars, &vph->list);
+			cur_arg++;
+		}
+	}
 	else if (*args[0]) {
 		ha_alert("parsing [%s:%d] : unknown keyword '%s' in spoe-agent section.\n",
 			 file, linenum, args[0]);
@@ -3779,6 +3807,7 @@
 	struct spoe_message         *msg, *msgback;
 	struct spoe_group           *grp, *grpback;
 	struct spoe_placeholder     *ph, *phback;
+	struct spoe_var_placeholder *vph, *vphback;
 	char                        *file = NULL, *engine = NULL;
 	int                          ret, pos = *cur_arg + 1;
 
@@ -3834,6 +3863,7 @@
 	LIST_INIT(&curgrps);
 	LIST_INIT(&curmphs);
 	LIST_INIT(&curgphs);
+	LIST_INIT(&curvars);
 	ret = readcfgfile(file);
 	curproxy = NULL;
 
@@ -4061,6 +4091,25 @@
 		LIST_DEL(&ph->list);
 		spoe_release_placeholder(ph);
 	}
+	list_for_each_entry_safe(vph, vphback, &curvars, list) {
+		struct arg arg;
+
+		trash.len = snprintf(trash.str, trash.size, "proc.%s.%s",
+				     curagent->var_pfx, vph->name);
+
+		arg.type = ARGT_STR;
+		arg.data.str.str = trash.str;
+		arg.data.str.len = trash.len;
+		if (!vars_check_arg(&arg, err)) {
+			memprintf(err, "SPOE agent '%s': failed to register variable %s.%s (%s)",
+				  curagent->id, curagent->var_pfx, vph->name, *err);
+			goto error;
+		}
+
+		LIST_DEL(&vph->list);
+		free(vph->name);
+		free(vph);
+	}
 	list_for_each_entry_safe(grp, grpback, &curgrps, list) {
 		LIST_DEL(&grp->list);
 		spoe_release_group(grp);
@@ -4081,6 +4130,11 @@
 		LIST_DEL(&ph->list);
 		spoe_release_placeholder(ph);
 	}
+	list_for_each_entry_safe(vph, vphback, &curvars, list) {
+		LIST_DEL(&vph->list);
+		free(vph->name);
+		free(vph);
+	}
 	list_for_each_entry_safe(grp, grpback, &curgrps, list) {
 		LIST_DEL(&grp->list);
 		spoe_release_group(grp);