diff --git a/CHANGELOG b/CHANGELOG
index 819f926..5fd9a12 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+*SVN*
+
+* Handle case-sensitivity in Selector tag names better. Closes #5052. [mexx, Andrew Dupont]
+
 *1.6.0.1* (December 4, 2007)
 
 * Change document.viewport.getDimensions to exclude scrollbars in all cases. Closes #10148, #9288. [Nick Stackenburg]
diff --git a/src/selector.js b/src/selector.js
index f49d539..b5814d6 100644
--- a/src/selector.js
+++ b/src/selector.js
@@ -396,7 +396,7 @@ Object.extend(Selector, {
     
     // TOKEN FUNCTIONS
     tagName: function(nodes, root, tagName, combinator) {
-      tagName = tagName.toUpperCase();
+      var uTagName = tagName.toUpperCase();
       var results = [], h = Selector.handlers;
       if (nodes) {
         if (combinator) {
@@ -409,7 +409,7 @@ Object.extend(Selector, {
           if (tagName == "*") return nodes;
         }
         for (var i = 0, node; node = nodes[i]; i++)
-          if (node.tagName.toUpperCase() == tagName) results.push(node);
+          if (node.tagName.toUpperCase() === uTagName) results.push(node);
         return results;
       } else return root.getElementsByTagName(tagName);
     },