Index: src/OFXMLParser.m
==================================================================
--- src/OFXMLParser.m
+++ src/OFXMLParser.m
@@ -54,11 +54,11 @@
 			if (entity[i] >= '0' && entity[i] <= '9')
 				c = (c << 4) + (entity[i] - '0');
 			else if (entity[i] >= 'A' && entity[i] <= 'F')
 				c = (c << 4) + (entity[i] - 'A' + 10);
 			else if (entity[i] >= 'a' && entity[i] <= 'f')
-				c = (c << 4) + (entity[i] - 'A' + 10);
+				c = (c << 4) + (entity[i] - 'a' + 10);
 			else
 				return nil;
 		}
 	} else {
 		for (i = 0; i < length; i++) {

Index: tests/string.m
==================================================================
--- tests/string.m
+++ tests/string.m
@@ -256,11 +256,11 @@
 	    [s[0] isEqual: @"&lt;hello&gt; &amp;world&apos;&quot;!&amp;"])
 
 	TEST(@"-[stringByXMLUnescaping]",
 	    [[s[0] stringByXMLUnescaping] isEqual: @"<hello> &world'\"!&"] &&
 	    [[@"&#x79;" stringByXMLUnescaping] isEqual: @"y"] &&
-	    [[@"&#xE4;" stringByXMLUnescaping] isEqual: @"ä"] &&
+	    [[@"&#xe4;" stringByXMLUnescaping] isEqual: @"ä"] &&
 	    [[@"&#8364;" stringByXMLUnescaping] isEqual: @"€"] &&
 	    [[@"&#x1D11E;" stringByXMLUnescaping] isEqual: @"𝄞"])
 
 	EXPECT_EXCEPTION(@"Detect invalid entities in -[stringByXMLUnescaping] "
 	    @"#1", OFInvalidEncodingException, [@"&foo;" stringByXMLUnescaping])