diff --git a/lib/client/layout.js b/lib/client/layout.js
index 46d7d59..5048d3e 100644
--- a/lib/client/layout.js
+++ b/lib/client/layout.js
@@ -66,8 +66,9 @@ BlazeLayout._updateRegions = function _updateRegions(regions) {
   _.each(regions, function(value, key) {
     // if this key does not yet exist then blaze
     // has no idea about this key and it won't get the value of this key
-    // so, we need to force a re-render
-    if(currentData && currentData[key] === undefined) {
+    // so, we need to force a re-render.
+    // needsRerender when new value of region is different from current one
+    if(value === undefined || (currentData && currentData[key]() !== value)) {
       needsRerender = true;
       // and, add the data function for this new key
       currentData[key] = BlazeLayout._buildRegionGetter(key);