diff --git a/library/src/main/java/com/github/aakira/expandablelayout/ExpandableRelativeLayout.java b/library/src/main/java/com/github/aakira/expandablelayout/ExpandableRelativeLayout.java
index 7c3de98..5a87e1f 100644
--- a/library/src/main/java/com/github/aakira/expandablelayout/ExpandableRelativeLayout.java
+++ b/library/src/main/java/com/github/aakira/expandablelayout/ExpandableRelativeLayout.java
@@ -109,7 +109,7 @@ protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
                 }
                 childPositionList.add(sumSize + childSize + childMargin);
             }
-            layoutSize = getCurrentPosition();
+            layoutSize = childPositionList.get(childPositionList.size() - 1);
 
             if (0 < layoutSize) {
                 isCalculatedSize = true;