diff --git a/appveyor.yml b/appveyor.yml
index 42bde5a..52cd5f1 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -2,7 +2,7 @@
 version: "{branch} {build}"
 
 environment:
-  JAVA_HOME: C:\Program Files\Java\jdk1.8.0
+  JAVA_HOME: C:\Program Files\Java\jdk9
   matrix:
     - JAVA_OPTS: ""
     - JAVA_OPTS: "-Djava.awt.headless=true -Dtestfx.robot=glass -Dtestfx.headless=true -Dprism.order=sw -Dprism.text=t2k -Dtestfx.setup.timeout=2500"
diff --git a/src/main/java/org/fxmisc/flowless/VirtualizedScrollPane.java b/src/main/java/org/fxmisc/flowless/VirtualizedScrollPane.java
index 8007200..1b71fbf 100644
--- a/src/main/java/org/fxmisc/flowless/VirtualizedScrollPane.java
+++ b/src/main/java/org/fxmisc/flowless/VirtualizedScrollPane.java
@@ -269,12 +269,12 @@ protected double computeMaxHeight(double width) {
 
     @Override
     protected void layoutChildren() {
-        double layoutWidth = snapSize(getLayoutBounds().getWidth());
-        double layoutHeight = snapSize(getLayoutBounds().getHeight());
+        double layoutWidth = snapSizeX(getLayoutBounds().getWidth());
+        double layoutHeight = snapSizeY(getLayoutBounds().getHeight());
         boolean vbarVisible = vbar.isVisible();
         boolean hbarVisible = hbar.isVisible();
-        double vbarWidth = snapSize(vbarVisible ? vbar.prefWidth(-1) : 0);
-        double hbarHeight = snapSize(hbarVisible ? hbar.prefHeight(-1) : 0);
+        double vbarWidth = snapSizeY(vbarVisible ? vbar.prefWidth(-1) : 0);
+        double hbarHeight = snapSizeX(hbarVisible ? hbar.prefHeight(-1) : 0);
 
         double w = layoutWidth - vbarWidth;
         double h = layoutHeight - hbarHeight;