diff --git a/src/cfgparse-listen.c b/src/cfgparse-listen.c
index 70627c30a..77a5d5b8f 100644
--- a/src/cfgparse-listen.c
+++ b/src/cfgparse-listen.c
@@ -807,6 +807,14 @@ int cfg_parse_listen(const char *file, int linenum, char **args, int kwm)
 			goto out;
 		}
 
+		if (strcasecmp(args[1], "or") == 0) {
+			ha_warning("parsing [%s:%d] : acl name '%s' will never match. 'or' is used to express a "
+				   "logical disjunction within a condition.\n",
+				   file, linenum, args[1]);
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
+
 		if (parse_acl((const char **)args + 1, &curproxy->acl, &errmsg, &curproxy->conf.args, file, linenum) == NULL) {
 			ha_alert("parsing [%s:%d] : error detected while parsing ACL '%s' : %s.\n",
 				 file, linenum, args[1], errmsg);
diff --git a/src/fcgi-app.c b/src/fcgi-app.c
index f7108c376..7b28e3a9c 100644
--- a/src/fcgi-app.c
+++ b/src/fcgi-app.c
@@ -885,11 +885,20 @@ static int cfg_parse_fcgi_app(const char *file, int linenum, char **args, int kw
 			ha_alert("parsing [%s:%d] : character '%c' is not permitted in acl name '%s'.\n",
 				 file, linenum, *err, args[1]);
 			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
 		}
-		else if (parse_acl((const char **)args+1, &curapp->acls, &errmsg, &curapp->conf.args, file, linenum) == NULL) {
+		if (strcasecmp(args[1], "or") == 0) {
+			ha_warning("parsing [%s:%d] : acl name '%s' will never match. 'or' is used to express a "
+				   "logical disjunction within a condition.\n",
+				   file, linenum, args[1]);
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
+		if (parse_acl((const char **)args+1, &curapp->acls, &errmsg, &curapp->conf.args, file, linenum) == NULL) {
 			ha_alert("parsing [%s:%d] : error detected while parsing ACL '%s' : %s.\n",
 				 file, linenum, args[1], errmsg);
 			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
 		}
 	}
 	else if (!strcmp(args[0], "set-param")) {
diff --git a/src/flt_spoe.c b/src/flt_spoe.c
index e3328cc01..06c70d24f 100644
--- a/src/flt_spoe.c
+++ b/src/flt_spoe.c
@@ -3991,6 +3991,13 @@ cfg_parse_spoe_message(const char *file, int linenum, char **args, int kwm)
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto out;
 		}
+		if (strcasecmp(args[1], "or") == 0) {
+			ha_warning("parsing [%s:%d] : acl name '%s' will never match. 'or' is used to express a "
+				   "logical disjunction within a condition.\n",
+				   file, linenum, args[1]);
+			err_code |= ERR_ALERT | ERR_FATAL;
+			goto out;
+		}
 		if (parse_acl((const char **)args + 1, &curmsg->acls, &errmsg, &curproxy->conf.args, file, linenum) == NULL) {
 			ha_alert("parsing [%s:%d] : error detected while parsing ACL '%s' : %s.\n",
 				 file, linenum, args[1], errmsg);