diff --git a/src/cache.c b/src/cache.c
index e871a7b..ee42947 100644
--- a/src/cache.c
+++ b/src/cache.c
@@ -1644,7 +1644,7 @@
 		chunk_istcat(trash, ctx.value);
 	}
 
-	chunk_memcat(trash, uri.ptr, uri.len);
+	chunk_istcat(trash, uri);
 
 	/* hash everything */
 	blk_SHA1_Init(&sha1_ctx);
diff --git a/src/http_fetch.c b/src/http_fetch.c
index aa4965d..99dc89a 100644
--- a/src/http_fetch.c
+++ b/src/http_fetch.c
@@ -874,7 +874,7 @@
 
 		if (temp->data)
 			temp->area[temp->data++] = del;
-		chunk_memcat(temp, n.ptr, n.len);
+		chunk_istcat(temp, n);
 	}
 
 	smp->data.type = SMP_T_STR;
diff --git a/src/http_htx.c b/src/http_htx.c
index 6b06336..3535fa7 100644
--- a/src/http_htx.c
+++ b/src/http_htx.c
@@ -432,7 +432,7 @@
 	vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
 
 	chunk_memcat(temp, uri.ptr, p.ptr - uri.ptr);         /* uri: host part */
-	chunk_memcat(temp, path.ptr, path.len);               /* uri: new path */
+	chunk_istcat(temp, path);                             /* uri: new path */
 	chunk_memcat(temp, p.ptr + plen, p.len - plen);       /* uri: QS part */
 	uri = ist2(temp->area + meth.len + vsn.len, uri.len - plen + path.len);
 
@@ -711,7 +711,7 @@
 	vsn = ist2(temp->area + meth.len, HTX_SL_REQ_VLEN(sl));
 
 	chunk_memcat(temp, uri.ptr, authority.ptr - uri.ptr);
-	chunk_memcat(temp, host.ptr, host.len);
+	chunk_istcat(temp, host);
 	chunk_memcat(temp, istend(authority), istend(uri) - istend(authority));
 	uri = ist2(temp->area + meth.len + vsn.len, host.len + uri.len - authority.len); /* uri */
 
diff --git a/src/mux_fcgi.c b/src/mux_fcgi.c
index f20b46b..ba3a546 100644
--- a/src/mux_fcgi.c
+++ b/src/mux_fcgi.c
@@ -1242,17 +1242,17 @@
 	if (!(params->mask & FCGI_SP_REQ_METH)) {
 		p  = htx_sl_req_meth(sl);
 		params->meth = ist2(b_tail(params->p), p.len);
-		chunk_memcat(params->p, p.ptr, p.len);
+		chunk_istcat(params->p, p);
 	}
 	if (!(params->mask & FCGI_SP_REQ_URI)) {
 		p = h1_get_uri(sl);
 		params->uri = ist2(b_tail(params->p), p.len);
-		chunk_memcat(params->p, p.ptr, p.len);
+		chunk_istcat(params->p, p);
 	}
 	if (!(params->mask & FCGI_SP_SRV_PROTO)) {
 		p  = htx_sl_req_vsn(sl);
 		params->vsn = ist2(b_tail(params->p), p.len);
-		chunk_memcat(params->p, p.ptr, p.len);
+		chunk_istcat(params->p, p);
 	}
 	if (!(params->mask & FCGI_SP_SRV_PORT)) {
 		char *end;
@@ -1361,7 +1361,7 @@
 		/* Decode the path. it must first be copied to keep the URI
 		 * untouched.
 		 */
-		chunk_memcat(params->p, path.ptr, path.len);
+		chunk_istcat(params->p, path);
 		path.ptr = b_tail(params->p) - path.len;
 		len = url_decode(ist0(path), 0);
 		if (len < 0)
@@ -1415,7 +1415,7 @@
 			struct ist sn = params->scriptname;
 
 			params->scriptname = ist2(b_tail(params->p), len+fconn->app->index.len);
-			chunk_memcat(params->p, sn.ptr, sn.len);
+			chunk_istcat(params->p, sn);
 			chunk_memcat(params->p, fconn->app->index.ptr, fconn->app->index.len);
 		}
 	}
diff --git a/src/tcpcheck.c b/src/tcpcheck.c
index bf497fe..294e49b 100644
--- a/src/tcpcheck.c
+++ b/src/tcpcheck.c
@@ -429,7 +429,7 @@
 	 *     4. Otherwise produce the generic tcp-check info message
 	 */
 	if (istlen(info)) {
-		chunk_strncat(msg, istptr(info), istlen(info));
+		chunk_istcat(msg, info);
 		goto comment;
 	}
 	else if (!LIST_ISEMPTY(&rule->expect.onerror_fmt)) {
@@ -517,7 +517,7 @@
 	 *     4. Otherwise produce the generic tcp-check info message
 	 */
 	if (istlen(info))
-		chunk_strncat(msg, istptr(info), istlen(info));
+		chunk_istcat(msg, info);
 	if (!LIST_ISEMPTY(&rule->expect.onsuccess_fmt))
 		msg->data += sess_build_logline(check->sess, NULL, b_tail(msg), b_room(msg),
 						&rule->expect.onsuccess_fmt);