diff --git a/include/haproxy/backend-t.h b/include/haproxy/backend-t.h
index f0a9bf354..a27fad853 100644
--- a/include/haproxy/backend-t.h
+++ b/include/haproxy/backend-t.h
@@ -144,6 +144,11 @@
  */
 #define BE_WEIGHT_SCALE 16
 
+/* LB parameters for all algorithms, with one instance per thread-group */
+struct lbprm_per_tgrp {
+	union {
+	};
+};
 /* LB parameters for all algorithms */
 struct lbprm {
 	union { /* LB parameters depending on the algo type */
diff --git a/include/haproxy/proxy-t.h b/include/haproxy/proxy-t.h
index c2aeefed1..4f062a017 100644
--- a/include/haproxy/proxy-t.h
+++ b/include/haproxy/proxy-t.h
@@ -302,6 +302,7 @@ struct error_snapshot {
 /* Each proxy will have one occurrence of this structure per thread group */
 struct proxy_per_tgroup {
 	struct queue queue;
+	struct lbprm_per_tgrp lbprm;
 } THREAD_ALIGNED(64);
 
 struct proxy {