diff --git a/libusb/descriptor.c b/libusb/descriptor.c
index 74d6de5..0b0e314 100644
--- a/libusb/descriptor.c
+++ b/libusb/descriptor.c
@@ -1174,7 +1174,7 @@ int API_EXPORTED libusb_get_string_descriptor_ascii(libusb_device_handle *dev_ha
 		return LIBUSB_ERROR_IO;
 
 	if (tbuf[0] > r)
-		return LIBUSB_ERROR_IO;
+		tbuf[0] = r;
 
 	di = 0;
 	for (si = 2; si < tbuf[0]; si += 2) {
-- 
2.17.0

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<div class='path'>path: <a href='/guix/log/?id=a509b1e0cda77c58e5ed345d018ddf82f680c492'>root</a>/<a href='/guix/log/doc?id=a509b1e0cda77c58e5ed345d018ddf82f680c492'>doc</a>/<a href='/guix/log/doc/package-hello.json?id=a509b1e0cda77c58e5ed345d018ddf82f680c492'>package-hello.json</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/doc/package-hello.json?id=a509b1e0cda77c58e5ed345d018ddf82f680c492&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-04-16 23:41:52 +0200'>2020-04-16</span></td><td><a href='/guix/commit/doc/package-hello.json?id=c9f321e52a99dea93fcc099372ea0167150b9aac'>doc: Document building and installing from JSON files.</a><span class='msg-avail'>...<span class='msg-tooltip'>* doc/guix.texi (Invoking guix package): Augment pargraphs for
"--install-from-file".
(Invoking guix build): Document building from JSON files.
* doc/package-hello.json: New file.
* doc/local.mk (EXTRA_DIST): Add it.
</span></span></td><td>Ricardo Wurmus</td></tr>