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=0726d4ea7cb882dd1d3887303e260aba433dd1ef'>root</a>/<a href='/guix/log/gnu?id=0726d4ea7cb882dd1d3887303e260aba433dd1ef'>gnu</a>/<a href='/guix/log/gnu/packages?id=0726d4ea7cb882dd1d3887303e260aba433dd1ef'>packages</a>/<a href='/guix/log/gnu/packages/markup.scm?id=0726d4ea7cb882dd1d3887303e260aba433dd1ef'>markup.scm</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/gnu/packages/markup.scm?id=0726d4ea7cb882dd1d3887303e260aba433dd1ef&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2017-09-13 18:19:29 +0100'>2017-09-13</span></td><td><a href='/guix/commit/gnu/packages/markup.scm?id=9d46919f9c0898f88e0635efeb837efcc9144fb9'>gnu: Add perl-text-markdown-discount.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/markdown.scm (perl-text-markdown-discount): New variable.
* gnu/packages/patches/perl-text-markdown-discount-use-system-markdown.patch:
  New file.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2017-09-13 18:19:29 +0100'>2017-09-13</span></td><td><a href='/guix/commit/gnu/packages/markup.scm?id=31d3a7c729068681a3a05036a3fe993213635fc6'>gnu: Add discount.</a><span class='msg-avail'>...<span class='msg-tooltip'>This is required by perl-text-markdown-discount, which is required by ikiwiki.

* gnu/packages/markdown.scm (discount) New variable.
</span></span></td><td>Christopher Baines</td></tr>
<tr><td><span title='2017-08-04 01:51:23 +0200'>2017-08-04</span></td><td><a href='/guix/commit/gnu/packages/markup.scm?id=b55d15e795f55c521e3a3c22cc98138b47030e4c'>gnu: cmark: Update to 0.28.0.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/markup.scm (cmark): Update to 0.28.0.
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>