diff --git a/src/test/java/picocli/CommandLineTest.java b/src/test/java/picocli/CommandLineTest.java
index <HASH>..<HASH> 100644
--- a/src/test/java/picocli/CommandLineTest.java
+++ b/src/test/java/picocli/CommandLineTest.java
@@ -2804,7 +2804,7 @@ public class CommandLineTest {
 
     @Test
     public void testAtFileSimplifiedWithQuotesTrimmed() {
-        System.setProperty("picocli.useSimplifiedAtFiles", "true");
+        System.setProperty("picocli.useSimplifiedAtFiles", "");
         System.setProperty("picocli.trimQuotes", "true");
         class App {
             @Option(names = "--quotedArg")
#<I> added Interpreter tests - simplified at files with empty sysprop