diff --git a/tests/test_Layer_Grid.html b/tests/test_Layer_Grid.html
index 26af11b7fa..9bfa35e520 100644
--- a/tests/test_Layer_Grid.html
+++ b/tests/test_Layer_Grid.html
@@ -74,6 +74,8 @@
         var testBounds = new OpenLayers.Bounds(1,2,3,4);
         
         t.ok( bounds.equals(testBounds), "getGridBounds() returns correct bounds")
+
+        layer.grid = null;
     }
 
     function test_05_Layer_Grid_getResolution(t) {
@@ -148,6 +150,8 @@
         t.eq( clone.tileSize.w, 500, "changing layer.tileSize does not change clone.tileSize -- a fresh copy was made, not just copied reference");
 
         t.eq( clone.alpha, layer.alpha, "alpha copied correctly");
+
+        layer.grid = null;
     }
 
     function test_11_Layer_Grid_setMap(t) {
diff --git a/tests/test_Layer_KaMap.html b/tests/test_Layer_KaMap.html
index 7195b984f2..2a8a404637 100644
--- a/tests/test_Layer_KaMap.html
+++ b/tests/test_Layer_KaMap.html
@@ -67,6 +67,8 @@
         var testBounds = new OpenLayers.Bounds(1,2,3,4);
         
         t.ok( bounds.equals(testBounds), "getKaMapBounds() returns correct bounds")
+        
+        layer.grid = null;
     }
 
     function test_05_Layer_KaMap_getResolution(t) {
@@ -141,6 +143,8 @@
         t.eq( clone.tileSize.w, 500, "changing layer.tileSize does not change clone.tileSize -- a fresh copy was made, not just copied reference");
 
         t.eq( clone.alpha, layer.alpha, "alpha copied correctly");
+
+        layer.grid = null;
     }
 
     function test_11_Layer_KaMap_setMap(t) {
diff --git a/tests/test_Layer_WMS.html b/tests/test_Layer_WMS.html
index 04de0b2057..d702dab1d1 100644
--- a/tests/test_Layer_WMS.html
+++ b/tests/test_Layer_WMS.html
@@ -86,6 +86,8 @@
         t.eq( clone.tileSize.w, 500, "changing layer.tileSize does not change clone.tileSize -- a fresh copy was made, not just copied reference");
 
         t.eq( clone.alpha, layer.alpha, "alpha copied correctly");
+
+        layer.grid = null;
     }
 
     function test_05_Layer_WMS_isBaseLayer(t) {