diff --git a/org.eclipse.jgit.ui/src/org/eclipse/jgit/awtui/CommitGraphPane.java b/org.eclipse.jgit.ui/src/org/eclipse/jgit/awtui/CommitGraphPane.java
index effe6e575..13d408f19 100644
--- a/org.eclipse.jgit.ui/src/org/eclipse/jgit/awtui/CommitGraphPane.java
+++ b/org.eclipse.jgit.ui/src/org/eclipse/jgit/awtui/CommitGraphPane.java
@@ -176,7 +176,7 @@ PersonIdent authorFor(final PlotCommit<SwingLane> c) {
 		}
 	}
 
-	class NameCellRender extends DefaultTableCellRenderer {
+	static class NameCellRender extends DefaultTableCellRenderer {
 		private static final long serialVersionUID = 1L;
 
 		public Component getTableCellRendererComponent(final JTable table,
@@ -194,7 +194,7 @@ public Component getTableCellRendererComponent(final JTable table,
 		}
 	}
 
-	class DateCellRender extends DefaultTableCellRenderer {
+	static class DateCellRender extends DefaultTableCellRenderer {
 		private static final long serialVersionUID = 1L;
 
 		private final DateFormat fmt = new SimpleDateFormat(
@@ -215,7 +215,7 @@ public Component getTableCellRendererComponent(final JTable table,
 		}
 	}
 
-	class GraphCellRender extends DefaultTableCellRenderer {
+	static class GraphCellRender extends DefaultTableCellRenderer {
 		private static final long serialVersionUID = 1L;
 
 		private final AWTPlotRenderer renderer = new AWTPlotRenderer(this);