diff --git a/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/dataframe/analyses/RegressionTests.java b/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/dataframe/analyses/RegressionTests.java
index deccf61ba6a..77429141ed2 100644
--- a/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/dataframe/analyses/RegressionTests.java
+++ b/x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/ml/dataframe/analyses/RegressionTests.java
@@ -33,7 +33,7 @@ public class RegressionTests extends AbstractSerializingTestCase<Regression> {
         Integer maximumNumberTrees = randomBoolean() ? null : randomIntBetween(1, 2000);
         Double featureBagFraction = randomBoolean() ? null : randomDoubleBetween(0.0, 1.0, false);
         String predictionFieldName = randomBoolean() ? null : randomAlphaOfLength(10);
-        Double trainingPercent = randomBoolean() ? null : randomDoubleBetween(0.0, 100.0, true);
+        Double trainingPercent = randomBoolean() ? null : randomDoubleBetween(1.0, 100.0, true);
         return new Regression(randomAlphaOfLength(10), lambda, gamma, eta, maximumNumberTrees, featureBagFraction,
             predictionFieldName, trainingPercent);
     }