diff --git a/src/com/jpexs/decompiler/flash/gui/MainPanel.java b/src/com/jpexs/decompiler/flash/gui/MainPanel.java
index c5ffcb93e..d79da3fb8 100644
--- a/src/com/jpexs/decompiler/flash/gui/MainPanel.java
+++ b/src/com/jpexs/decompiler/flash/gui/MainPanel.java
@@ -424,7 +424,9 @@ public final class MainPanel extends JPanel implements TreeSelectionListener, Se
     private JPanel createFolderPreviewCard() {
         JPanel folderPreviewCard = new JPanel(new BorderLayout());
         folderPreviewPanel = new FolderPreviewPanel(this, new ArrayList<>());
-        folderPreviewCard.add(new JScrollPane(folderPreviewPanel), BorderLayout.CENTER);
+	final JScrollPane jScrollPane = new JScrollPane(folderPreviewPanel);
+	jScrollPane.getVerticalScrollBar().setUnitIncrement(20);
+        folderPreviewCard.add(jScrollPane, BorderLayout.CENTER);
 
         return folderPreviewCard;
     }