diff --git a/javafx-ui-controls/src/com/sun/javafx/scene/control/skin/NestedTableColumnHeader.java b/javafx-ui-controls/src/com/sun/javafx/scene/control/skin/NestedTableColumnHeader.java
--- a/javafx-ui-controls/src/com/sun/javafx/scene/control/skin/NestedTableColumnHeader.java
+++ b/javafx-ui-controls/src/com/sun/javafx/scene/control/skin/NestedTableColumnHeader.java
@@ -417,7 +417,7 @@
         for (TableColumnHeader n : getColumnHeaders()) {
             if (! n.isVisible()) continue;
             
-            double prefWidth = n.prefWidth(-1);
+            double prefWidth = snapSize(n.prefWidth(-1));
 //            double prefHeight = n.prefHeight(-1);
 
             // position the column header in the default location...
@@ -453,7 +453,7 @@
         if (getColumns() != null) {
             for (TableColumnHeader c : getColumnHeaders()) {
                 if (c.isVisible()) {
-                    width += c.computePrefWidth(height);
+                    width += snapSize(c.computePrefWidth(height));
                 }
             }
         }