diff --git a/include/common/buffer.h b/include/common/buffer.h
index 0c8eeb019..8638bd684 100644
--- a/include/common/buffer.h
+++ b/include/common/buffer.h
@@ -105,16 +105,6 @@ static inline void bo_del(struct buffer *b, unsigned int del)
 	b->o -= del;
 }
 
-/* Returns the amount of output data that can contiguously be read at once */
-static inline int bo_contig_data(const struct buffer *b)
-{
-	char *beg = b->p - b->o;
-
-	if (beg < b->data)
-		return b->data - beg;
-	return b->o;
-}
-
 /* Return the amount of bytes that can be written into the input area at once
  * including reserved space which may be overwritten (this is the caller
  * responsibility to know if the reserved space is protected or not).
diff --git a/src/flt_http_comp.c b/src/flt_http_comp.c
index 0ccf23b12..99b18cc4f 100644
--- a/src/flt_http_comp.c
+++ b/src/flt_http_comp.c
@@ -720,7 +720,10 @@ http_compression_buffer_end(struct comp_state *st, struct stream *s,
 
 	/* Copy previous data from ib->o into ob->o */
 	if (ib->o > 0) {
-		left = bo_contig_data(ib);
+		left = b_contig_data(ib, 0);
+		if (left > ib->o)
+			left = ib->o;
+
 		memcpy(ob->p - ob->o, b_head(ib), left);
 		if (ib->o - left) /* second part of the buffer */
 			memcpy(ob->p - ob->o + left, ib->data, ib->o - left);
diff --git a/src/ssl_sock.c b/src/ssl_sock.c
index 56d2eed7f..e694c8721 100644
--- a/src/ssl_sock.c
+++ b/src/ssl_sock.c
@@ -5526,7 +5526,9 @@ static int ssl_sock_from_buf(struct connection *conn, struct buffer *buf, int fl
 		size_t written_data;
 #endif
 
-		try = bo_contig_data(buf);
+		try = b_contig_data(buf, 0);
+		if (try > buf->o)
+			try = buf->o;
 
 		if (!(flags & CO_SFL_STREAMER) &&
 		    !(conn->xprt_st & SSL_SOCK_SEND_UNLIMITED) &&