1 files changed, 2 insertions, 2 deletions
diff --git a/core/src/test/java/org/elasticsearch/monitor/jvm/JvmGcMonitorServiceSettingsTests.java b/core/src/test/java/org/elasticsearch/monitor/jvm/JvmGcMonitorServiceSettingsTests.java
index dc374f1333..48817e52d5 100644
--- a/core/src/test/java/org/elasticsearch/monitor/jvm/JvmGcMonitorServiceSettingsTests.java
+++ b/core/src/test/java/org/elasticsearch/monitor/jvm/JvmGcMonitorServiceSettingsTests.java
@@ -55,7 +55,7 @@ public class JvmGcMonitorServiceSettingsTests extends ESTestCase {
     }
 
     public void testNegativeSetting() throws InterruptedException {
-        String collector = randomAsciiOfLength(5);
+        String collector = randomAlphaOfLength(5);
         Settings settings = Settings.builder().put("monitor.jvm.gc.collector." + collector + ".warn", "-" + randomTimeValue()).build();
         execute(settings, (command, interval, name) -> null, e -> {
             assertThat(e, instanceOf(IllegalArgumentException.class));
@@ -64,7 +64,7 @@ public class JvmGcMonitorServiceSettingsTests extends ESTestCase {
     }
 
     public void testMissingSetting() throws InterruptedException {
-        String collector = randomAsciiOfLength(5);
+        String collector = randomAlphaOfLength(5);
         Set<AbstractMap.SimpleEntry<String, String>> entries = new HashSet<>();
         entries.add(new AbstractMap.SimpleEntry<>("monitor.jvm.gc.collector." + collector + ".warn", randomPositiveTimeValue()));
         entries.add(new AbstractMap.SimpleEntry<>("monitor.jvm.gc.collector." + collector + ".info", randomPositiveTimeValue()));