diff --git a/addons/promex/service-prometheus.c b/addons/promex/service-prometheus.c
index 74310a366..60f927553 100644
--- a/addons/promex/service-prometheus.c
+++ b/addons/promex/service-prometheus.c
@@ -2144,7 +2144,7 @@ static void promex_appctx_handle_io(struct appctx *appctx)
 
 struct applet promex_applet = {
 	.obj_type = OBJ_TYPE_APPLET,
-	.flags = APPLET_FL_NEW_API,
+	.flags = APPLET_FL_NEW_API|APPLET_FL_HTX,
 	.name = "<PROMEX>", /* used for logging */
 	.init = promex_appctx_init,
 	.release = promex_appctx_release,
diff --git a/include/haproxy/applet-t.h b/include/haproxy/applet-t.h
index da6dc5024..e10c8240f 100644
--- a/include/haproxy/applet-t.h
+++ b/include/haproxy/applet-t.h
@@ -83,6 +83,7 @@ static forceinline char *appctx_show_flags(char *buf, size_t len, const char *de
 
 #define APPLET_FL_NEW_API 0x00000001 /* Set if the applet is based on the new API (using applet's buffers) */
 #define APPLET_FL_WARNED  0x00000002 /* Set when warning was already emitted about a legacy applet */
+#define APPLET_FL_HTX     0x00000004 /* Set if the applet is using HTX buffers */
 
 /* Applet descriptor */
 struct applet {
diff --git a/src/cache.c b/src/cache.c
index 7e86e6b96..52abe7d2c 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -3139,7 +3139,7 @@ INITCALL1(STG_REGISTER, http_req_keywords_register, &http_req_actions);
 
 struct applet http_cache_applet = {
 	.obj_type = OBJ_TYPE_APPLET,
-	.flags = APPLET_FL_NEW_API,
+	.flags = APPLET_FL_NEW_API|APPLET_FL_HTX,
 	.name = "<CACHE>", /* used for logging */
 	.fct = http_cache_io_handler,
 	.rcv_buf = appctx_htx_rcv_buf,
diff --git a/src/hlua.c b/src/hlua.c
index 5d17685f6..e8e2f90cf 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -11611,7 +11611,7 @@ static enum act_parse_ret action_register_service_http(const char **args, int *c
 
 	/* Add applet pointer in the rule. */
 	rule->applet.obj_type = OBJ_TYPE_APPLET;
-	rule->applet.flags = APPLET_FL_NEW_API;
+	rule->applet.flags = APPLET_FL_NEW_API|APPLET_FL_HTX;
 	rule->applet.name = fcn->name;
 	rule->applet.init = hlua_applet_http_init;
 	rule->applet.rcv_buf = appctx_htx_rcv_buf;
diff --git a/src/http_client.c b/src/http_client.c
index 875be1199..d72d75ba3 100644
--- a/src/http_client.c
+++ b/src/http_client.c
@@ -1022,7 +1022,7 @@ void httpclient_applet_release(struct appctx *appctx)
 /* HTTP client applet */
 static struct applet httpclient_applet = {
 	.obj_type = OBJ_TYPE_APPLET,
-	.flags = APPLET_FL_NEW_API,
+	.flags = APPLET_FL_NEW_API|APPLET_FL_HTX,
 	.name = "<HTTPCLIENT>",
 	.fct = httpclient_applet_io_handler,
 	.rcv_buf = appctx_htx_rcv_buf,
diff --git a/src/stats-html.c b/src/stats-html.c
index cd93630f6..e533535a8 100644
--- a/src/stats-html.c
+++ b/src/stats-html.c
@@ -2103,7 +2103,7 @@ static void http_stats_release(struct appctx *appctx)
 
 struct applet http_stats_applet = {
 	.obj_type = OBJ_TYPE_APPLET,
-	.flags = APPLET_FL_NEW_API,
+	.flags = APPLET_FL_NEW_API|APPLET_FL_HTX,
 	.name = "<STATS>", /* used for logging */
 	.fct = http_stats_io_handler,
 	.rcv_buf = appctx_htx_rcv_buf,