diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java b/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java
index f9d4881e9..153f177bb 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/gui/Main.java
@@ -69,7 +69,7 @@ public final class Main {
         final JFrame testFrame = new JFrame("CheckStyle");
         final ParseTreeInfoPanel panel = new ParseTreeInfoPanel();
         testFrame.getContentPane().add(panel);
-        panel.openAst(ast, testFrame);
+        panel.openAst(ast);
         testFrame.setSize(1500, 800);
         testFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
         testFrame.setVisible(true);
diff --git a/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java b/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java
index 4d1ea21de..d94489145 100644
--- a/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java
+++ b/src/main/java/com/puppycrawl/tools/checkstyle/gui/ParseTreeInfoPanel.java
@@ -41,13 +41,13 @@ import javax.swing.JTextArea;
 import javax.swing.SwingUtilities;
 import javax.swing.filechooser.FileFilter;
 
-import antlr.ANTLRException;
-
 import com.puppycrawl.tools.checkstyle.TreeWalker;
 import com.puppycrawl.tools.checkstyle.api.DetailAST;
 import com.puppycrawl.tools.checkstyle.api.FileContents;
 import com.puppycrawl.tools.checkstyle.api.FileText;
 
+import antlr.ANTLRException;
+
 /**
  * Displays information about a parse tree.
  * The user can change the file that is parsed and displayed
@@ -106,7 +106,7 @@ public class ParseTreeInfoPanel extends JPanel {
 
     }
 
-    public void openAst(DetailAST parseTree, final Component parent) {
+    public void openAst(DetailAST parseTree) {
         parseTreeModel.setParseTree(parseTree);
         reloadAction.setEnabled(true);