--- a/ipkg-build
+++ b/ipkg-build
@@ -133,7 +133,7 @@ You probably want to chown these to a sy
 	disallowed_filename=`disallowed_field Filename`
 	[ "$?" -ne 0 ] && PKG_ERROR=1
 
-	if echo $pkg | grep '[^a-z0-9.+-]'; then
+	if echo $pkg | grep '[^a-zA-Z0-9_.+-]'; then
 		echo "*** Error: Package name $name contains illegal characters, (other than [a-z0-9.+-])" >&2
 		PKG_ERROR=1;
 	fi
--- a/ipkg-buildpackage
+++ b/ipkg-buildpackage
@@ -69,7 +69,7 @@ pkg_appears_sane_control() {
 	required_field Maintainer >/dev/null
 	required_field Description >/dev/null
 
-	if echo $pkg | grep '[^a-z0-9.+-]'; then
+	if echo $pkg | grep '[^a-zA-Z0-9.+-]'; then
 		echo "ipkg-build: Error: Package name $name contains illegal characters, (other than [a-z0-9.+-])"
 		PKG_ERROR=1;
 	fi
pstream' href='/cgit/openwrt/upstream/'>openwrt/upstream</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='4405faae26cbddd63447a307200d928109286595'/><select name='h' onchange='this.form.submit();'>
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<table summary='blob content' class='blob'>
<tr><td class='linenumbers'><pre><a id='n1' href='#n1'>1</a>
<a id='n2' href='#n2'>2</a>
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<a id='n4' href='#n4'>4</a>
<a id='n5' href='#n5'>5</a>
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<a id='n7' href='#n7'>7</a>
<a id='n8' href='#n8'>8</a>
<a id='n9' href='#n9'>9</a>
<a id='n10' href='#n10'>10</a>
<a id='n11' href='#n11'>11</a>
<a id='n12' href='#n12'>12</a>
</pre></td>
<td class='lines'><pre><code>