diff --git a/tool/src/org/antlr/v4/gui/Interpreter.java b/tool/src/org/antlr/v4/gui/Interpreter.java
index 8ef804d147..71fe27ba54 100644
--- a/tool/src/org/antlr/v4/gui/Interpreter.java
+++ b/tool/src/org/antlr/v4/gui/Interpreter.java
@@ -62,7 +62,7 @@ public void importTokensFromTokensFile() {
 
 	public Interpreter(String[] args) throws Exception {
 		if ( args.length < 2 ) {
-			System.err.println("java org.antlr.v4.gui.Intrepreter [X.g4|XParser.g4 XLexer.g4] startRuleName\n" +
+			System.err.println("java org.antlr.v4.gui.Interpreter [X.g4|XParser.g4 XLexer.g4] startRuleName\n" +
 					"  [-tokens] [-tree] [-gui] [-encoding encodingname]\n" +
 					"  [-trace] [-profile filename.csv] [input-filename(s)]");
 			System.err.println("Omitting input-filename makes rig read from stdin.");