Index: uspace/lib/usb/src/pipesinit.c
===================================================================
--- uspace/lib/usb/src/pipesinit.c	(revision 27a001239f0ff2de46b2832c475f5a2a852ba253)
+++ uspace/lib/usb/src/pipesinit.c	(revision 8ba18c6d4012f3f645523fa1468c09c7b004ae62)
@@ -109,4 +109,5 @@
  * @param mapping_count Number of endpoint mappings in @p mapping.
  * @param found_endpoint Description of found endpoint.
+ * @param interface_number Number of currently processed interface.
  * @return Endpoint mapping corresponding to @p found_endpoint.
  * @retval NULL No corresponding endpoint found.
@@ -114,9 +115,15 @@
 static usb_endpoint_mapping_t *find_endpoint_mapping(
     usb_endpoint_mapping_t *mapping, size_t mapping_count,
-    usb_endpoint_description_t *found_endpoint)
+    usb_endpoint_description_t *found_endpoint,
+    int interface_number)
 {
 	while (mapping_count > 0) {
-		if (endpoint_fits_description(mapping->description,
-		    found_endpoint)) {
+		bool interface_number_fits = (mapping->interface_no < 0)
+		    || (mapping->interface_no == interface_number);
+
+		bool endpoint_descriptions_fits = endpoint_fits_description(
+		    mapping->description, found_endpoint);
+
+		if (interface_number_fits && endpoint_descriptions_fits) {
 			return mapping;
 		}
@@ -169,5 +176,5 @@
 	 */
 	usb_endpoint_mapping_t *ep_mapping = find_endpoint_mapping(mapping,
-	    mapping_count, &description);
+	    mapping_count, &description, interface->interface_number);
 	if (ep_mapping == NULL) {
 		return ENOENT;