diff --git a/doc/configuration.txt b/doc/configuration.txt
index 596ca47..d70c9d8 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -10272,6 +10272,7 @@
   |   | %Ts  | timestamp                                     | numeric     |
   |   | %Tt  | Tt                                            | numeric     |
   |   | %Tw  | Tw                                            | numeric     |
+  |   | %U   | bytes_uploaded (from client to server)        | numeric     |
   |   | %ac  | actconn                                       | numeric     |
   |   | %b   | backend_name                                  | string      |
   |   | %bc  | beconn                                        | numeric     |
diff --git a/include/types/log.h b/include/types/log.h
index ce0c717..c81ab0d 100644
--- a/include/types/log.h
+++ b/include/types/log.h
@@ -65,6 +65,7 @@
 	LOG_FMT_BACKEND,
 	LOG_FMT_SERVER,
 	LOG_FMT_BYTES,
+	LOG_FMT_BYTES_UP,
 	LOG_FMT_T,
 	LOG_FMT_TQ,
 	LOG_FMT_TW,
diff --git a/src/log.c b/src/log.c
index 24273a5..7483842 100644
--- a/src/log.c
+++ b/src/log.c
@@ -87,7 +87,8 @@
 	{ "ft", LOG_FMT_FRONTEND_XPRT, PR_MODE_TCP, LW_INIT, NULL },  /* frontend with transport mode */
 	{ "b", LOG_FMT_BACKEND, PR_MODE_TCP, LW_INIT, NULL },   /* backend */
 	{ "s", LOG_FMT_SERVER, PR_MODE_TCP, LW_SVID, NULL },    /* server */
-	{ "B", LOG_FMT_BYTES, PR_MODE_TCP, LW_BYTES, NULL },     /* bytes read */
+	{ "B", LOG_FMT_BYTES, PR_MODE_TCP, LW_BYTES, NULL },     /* bytes from server to client */
+	{ "U", LOG_FMT_BYTES_UP, PR_MODE_TCP, LW_BYTES, NULL },  /* bytes from client to server */
 	{ "Tq", LOG_FMT_TQ, PR_MODE_HTTP, LW_BYTES, NULL },       /* Tq */
 	{ "Tw", LOG_FMT_TW, PR_MODE_TCP, LW_BYTES, NULL },       /* Tw */
 	{ "Tc", LOG_FMT_TC, PR_MODE_TCP, LW_BYTES, NULL },       /* Tc */
@@ -1117,6 +1118,16 @@
 				last_isspace = 0;
 				break;
 
+			case LOG_FMT_BYTES_UP: // %U
+				if (!(tolog & LW_BYTES))
+					LOGCHAR('+');
+				ret = lltoa(s->logs.bytes_in, tmplog, dst + maxsize - tmplog);
+				if (ret == NULL)
+					goto out;
+				tmplog = ret;
+				last_isspace = 0;
+				break;
+
 			case LOG_FMT_CCLIENT: // %cc
 				src = txn->cli_cookie;
 				ret = lf_text(tmplog, src, dst + maxsize - tmplog, tmp);