diff --git a/server/src/test/java/org/elasticsearch/index/mapper/KeywordFieldMapperTests.java b/server/src/test/java/org/elasticsearch/index/mapper/KeywordFieldMapperTests.java
index fcdbbd3a7d268..d7c8fb8314b04 100644
--- a/server/src/test/java/org/elasticsearch/index/mapper/KeywordFieldMapperTests.java
+++ b/server/src/test/java/org/elasticsearch/index/mapper/KeywordFieldMapperTests.java
@@ -571,7 +571,7 @@ public void testScriptAndPrecludedParameters() {
 
     @Override
     protected Object generateRandomInputValue(MappedFieldType ft) {
-        return switch (between(0, 3)) {
+        return switch (between(0, 4)) {
             case 0 -> randomAlphaOfLengthBetween(1, 100);
             case 1 -> randomBoolean() ? null : randomAlphaOfLengthBetween(1, 100);
             case 2 -> randomLong();