diff --git a/include/haproxy/h2.h b/include/haproxy/h2.h
index 34ad4de..1b49b85 100644
--- a/include/haproxy/h2.h
+++ b/include/haproxy/h2.h
@@ -157,12 +157,13 @@
 } __attribute__((packed));
 
 // RFC7540 #11.3 : Settings Registry
-#define H2_SETTINGS_HEADER_TABLE_SIZE      0x0001
-#define H2_SETTINGS_ENABLE_PUSH            0x0002
-#define H2_SETTINGS_MAX_CONCURRENT_STREAMS 0x0003
-#define H2_SETTINGS_INITIAL_WINDOW_SIZE    0x0004
-#define H2_SETTINGS_MAX_FRAME_SIZE         0x0005
-#define H2_SETTINGS_MAX_HEADER_LIST_SIZE   0x0006
+#define H2_SETTINGS_HEADER_TABLE_SIZE       0x0001
+#define H2_SETTINGS_ENABLE_PUSH             0x0002
+#define H2_SETTINGS_MAX_CONCURRENT_STREAMS  0x0003
+#define H2_SETTINGS_INITIAL_WINDOW_SIZE     0x0004
+#define H2_SETTINGS_MAX_FRAME_SIZE          0x0005
+#define H2_SETTINGS_MAX_HEADER_LIST_SIZE    0x0006
+#define H2_SETTINGS_ENABLE_CONNECT_PROTOCOL 0x0008
 
 
 /* some protocol constants */
diff --git a/src/mux_h2.c b/src/mux_h2.c
index 1fc6ca0..b067f29 100644
--- a/src/mux_h2.c
+++ b/src/mux_h2.c
@@ -1593,6 +1593,10 @@
 		chunk_memcat(&buf, "\x00\x02\x00\x00\x00\x00", 6);
 	}
 
+	/* rfc 8441 #3 SETTINGS_ENABLE_CONNECT_PROTOCOL=1
+	 * sent automatically */
+	chunk_memcat(&buf, "\x00\x08\x00\x00\x00\x01", 6);
+
 	if (h2_settings_header_table_size != 4096) {
 		char str[6] = "\x00\x01"; /* header_table_size */
 
@@ -2197,6 +2201,10 @@
 				h2c->streams_limit = arg;
 			}
 			break;
+		case H2_SETTINGS_ENABLE_CONNECT_PROTOCOL:
+			/* nothing to do here as this settings is automatically
+			 * transmits to the client */
+			break;
 		}
 	}