diff --git a/CHANGELOG b/CHANGELOG
index 2a7b6bc..058d484 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* Reset the browser's dimensions to their original settings after running the DOM viewport tests.  [sam]
+
 * Fix the test runner for Firefox in Leopard.  [sam]
 
 * Use String#include wherever possible.
diff --git a/test/unit/dom.html b/test/unit/dom.html
index a484583..fb2438b 100644
--- a/test/unit/dom.html
+++ b/test/unit/dom.html
@@ -1517,27 +1517,31 @@
     }},
     
     testViewportDimensions: function() {with(this) {
-      window.resizeTo(800, 600);
-      var before = document.viewport.getDimensions();
-      window.resizeBy(50, 50);
-      var after  = document.viewport.getDimensions();
+      preservingBrowserDimensions(function() {
+        window.resizeTo(800, 600);
+        var before = document.viewport.getDimensions();
+        window.resizeBy(50, 50);
+        var after  = document.viewport.getDimensions();
       
-      assertEqual(before.width + 50, after.width, "NOTE: YOU MUST ALLOW JAVASCRIPT TO RESIZE YOUR WINDOW FOR THESE TESTS TO PASS");
-      assertEqual(before.height + 50, after.height, "NOTE: YOU MUST ALLOW JAVASCRIPT TO RESIZE YOUR WINDOW FOR THESE TESTS TO PASS");
+        assertEqual(before.width + 50, after.width, "NOTE: YOU MUST ALLOW JAVASCRIPT TO RESIZE YOUR WINDOW FOR THESE TESTS TO PASS");
+        assertEqual(before.height + 50, after.height, "NOTE: YOU MUST ALLOW JAVASCRIPT TO RESIZE YOUR WINDOW FOR THESE TESTS TO PASS");
+      }.bind(this));
     }},
     
     testViewportScrollOffsets: function() {with(this) {
-      window.scrollTo(0, 0);
-      assertEqual(0, document.viewport.getScrollOffsets().top);
+      preservingBrowserDimensions(function() {
+        window.scrollTo(0, 0);
+        assertEqual(0, document.viewport.getScrollOffsets().top);
       
-      window.scrollTo(0, 35);
-      assertEqual(35, document.viewport.getScrollOffsets().top);
+        window.scrollTo(0, 35);
+        assertEqual(35, document.viewport.getScrollOffsets().top);
       
-      window.resizeTo(200, 650);
-      window.scrollTo(25, 35);
-      assertEqual(25, document.viewport.getScrollOffsets().left);
+        window.resizeTo(200, 650);
+        window.scrollTo(25, 35);
+        assertEqual(25, document.viewport.getScrollOffsets().left);
       
-      window.resizeTo(850, 650);
+        window.resizeTo(850, 650);
+      }.bind(this));
     }},
     
     testNodeConstants: function() {with(this) {
@@ -1563,7 +1567,21 @@
       }, this);
     }}
   }, 'testlog');
+
+  function preservingBrowserDimensions(callback) {
+    var original = document.viewport.getDimensions();
+    window.resizeTo(640, 480);
+    var resized = document.viewport.getDimensions();
+    original.width += 640 - resized.width, original.height += 480 - resized.height;
     
+    try {
+      window.resizeTo(original.width, original.height);
+      callback();
+    } finally {
+      window.resizeTo(original.width, original.height);
+    }
+  }
+
 // ]]>
 </script>
 </body>