diff --git a/CHANGES.md b/CHANGES.md
index ec09cf6489a5..57cee6cb5f9e 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,15 @@
 Change Log
 ==========
 
+### 1.13 - 2015-09-01
+
+* Breaking changes
+  *
+* Deprecated
+  *
+* Fix issue where extruded `PolygonGeometry` was always extruding to the ellipsoid surface instead of specified height.
+ 
+
 ### 1.12 - 2015-08-03
 
 * Breaking changes
diff --git a/Source/Core/PolygonGeometry.js b/Source/Core/PolygonGeometry.js
index 5132683b1813..3614b0fbb27a 100644
--- a/Source/Core/PolygonGeometry.js
+++ b/Source/Core/PolygonGeometry.js
@@ -619,8 +619,8 @@ define([
         var perPositionHeight = defaultValue(options.perPositionHeight, false);
 
         var extrudedHeight = options.extrudedHeight;
-        var extrude = (defined(extrudedHeight) && (!CesiumMath.equalsEpsilon(height, extrudedHeight, CesiumMath.EPSILON6) || perPositionHeight));
-        if (extrude) {
+        var extrude = defined(extrudedHeight);
+        if (extrude && !perPositionHeight) {
             var h = extrudedHeight;
             extrudedHeight = Math.min(h, height);
             height = Math.max(h, height);
diff --git a/Source/Core/PolygonOutlineGeometry.js b/Source/Core/PolygonOutlineGeometry.js
index 7ee6ebfcfedb..5b3792bd6612 100644
--- a/Source/Core/PolygonOutlineGeometry.js
+++ b/Source/Core/PolygonOutlineGeometry.js
@@ -296,8 +296,8 @@ define([
         var perPositionHeight = defaultValue(options.perPositionHeight, false);
 
         var extrudedHeight = options.extrudedHeight;
-        var extrude = (defined(extrudedHeight) && (!CesiumMath.equalsEpsilon(height, extrudedHeight, CesiumMath.EPSILON6) || perPositionHeight));
-        if (extrude) {
+        var extrude = defined(extrudedHeight);
+        if (extrude && !perPositionHeight) {
             var h = extrudedHeight;
             extrudedHeight = Math.min(h, height);
             height = Math.max(h, height);