diff --git a/include/common/htx.h b/include/common/htx.h
index cd7db0526..78e62a500 100644
--- a/include/common/htx.h
+++ b/include/common/htx.h
@@ -111,8 +111,7 @@ enum htx_blk_type {
 	HTX_BLK_EOD    =  6, /* end-of-data block */
 	HTX_BLK_TLR    =  7, /* trailer name/value block */
 	HTX_BLK_EOM    =  8, /* end-of-message block */
-	/* 9 .. 13 unused */
-	HTX_BLK_OOB    = 14, /* Out of band block, don't alter the parser */
+	/* 9 .. 14 unused */
 	HTX_BLK_UNUSED = 15, /* unused/removed block */
 };
 
@@ -194,7 +193,6 @@ struct htx_blk *htx_add_pseudo_header(struct htx *htx,  enum htx_phdr_type phdr,
 struct htx_blk *htx_add_endof(struct htx *htx, enum htx_blk_type type);
 struct htx_blk *htx_add_data(struct htx *htx, const struct ist data);
 struct htx_blk *htx_add_trailer(struct htx *htx, const struct ist tlr);
-struct htx_blk *htx_add_oob(struct htx *htx, const struct ist oob);
 struct htx_blk *htx_add_data_before(struct htx *htx, const struct htx_blk *ref, const struct ist data);
 
 int htx_reqline_to_h1(const struct htx_sl *sl, struct buffer *chk);
@@ -534,7 +532,6 @@ static inline void htx_set_blk_value_len(struct htx_blk *blk, uint32_t vlen)
 		case HTX_BLK_RES_SL:
 		case HTX_BLK_DATA:
 		case HTX_BLK_TLR:
-		case HTX_BLK_OOB:
 			blk->info = (type << 28) + vlen;
 			break;
 		default:
@@ -593,7 +590,6 @@ static inline struct ist htx_get_blk_value(const struct htx *htx, const struct h
 		case HTX_BLK_RES_SL:
 		case HTX_BLK_DATA:
 		case HTX_BLK_TLR:
-		case HTX_BLK_OOB:
 			ret.ptr = htx_get_blk_ptr(htx, blk);
 			ret.len = blk->info & 0xfffffff;
 			break;
@@ -765,7 +761,6 @@ static inline const char *htx_blk_type_str(enum htx_blk_type type)
 		case HTX_BLK_EOD:    return "HTX_BLK_EOD";
 		case HTX_BLK_TLR:    return "HTX_BLK_TLR";
 		case HTX_BLK_EOM:    return "HTX_BLK_EOM";
-		case HTX_BLK_OOB:    return "HTX_BLK_OOB";
 		case HTX_BLK_UNUSED: return "HTX_BLK_UNUSED";
 		default:             return "HTX_BLK_???";
 	};
diff --git a/src/htx.c b/src/htx.c
index 25848d3d3..525f7ef69 100644
--- a/src/htx.c
+++ b/src/htx.c
@@ -802,23 +802,6 @@ struct htx_blk *htx_add_trailer(struct htx *htx, const struct ist tlr)
 	return blk;
 }
 
-/* Adds an HTX block of type OOB in <htx>. It returns the new block on
- * success. Otherwise, it returns NULL.
- */
-struct htx_blk *htx_add_oob(struct htx *htx, const struct ist oob)
-{
-	struct htx_blk *blk;
-
-	/* FIXME: check oob.len (< 256MB) */
-	blk = htx_add_blk(htx, HTX_BLK_OOB, oob.len);
-	if (!blk)
-		return NULL;
-
-	blk->info += oob.len;
-	memcpy(htx_get_blk_ptr(htx, blk), oob.ptr, oob.len);
-	return blk;
-}
-
 struct htx_blk *htx_add_data_before(struct htx *htx, const struct htx_blk *ref,
 				    const struct ist data)
 {
diff --git a/src/mux_h1.c b/src/mux_h1.c
index 6c85c11ae..d91f45d78 100644
--- a/src/mux_h1.c
+++ b/src/mux_h1.c
@@ -1644,12 +1644,6 @@ static size_t h1_process_output(struct h1c *h1c, struct buffer *buf, size_t coun
 				h1m->state = H1_MSG_DONE;
 				break;
 
-			case HTX_BLK_OOB:
-				v = htx_get_blk_value(chn_htx, blk);
-				if (!chunk_memcat(tmp, v.ptr, v.len))
-					goto copy;
-				break;
-
 			default:
 				h1m->flags |= errflag;
 				break;