diff --git a/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/RegressionEvaluator.java b/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/RegressionEvaluator.java
index 263a69aa0bd..f61c409d2eb 100644
--- a/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/RegressionEvaluator.java
+++ b/solr/solrj/src/java/org/apache/solr/client/solrj/io/eval/RegressionEvaluator.java
@@ -72,6 +72,7 @@ public class RegressionEvaluator extends ComplexEvaluator implements Expressible
     map.put("intercept", regression.getIntercept());
     map.put("R", regression.getR());
     map.put("N", regression.getN());
+    map.put("RSquare", regression.getRSquare());
     map.put("regressionSumSquares", regression.getRegressionSumSquares());
     map.put("slopeConfidenceInterval", regression.getSlopeConfidenceInterval());
     map.put("interceptStdErr", regression.getInterceptStdErr());
diff --git a/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/StreamExpressionTest.java b/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/StreamExpressionTest.java
index 94f4106439a..699a5629d1d 100644
--- a/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/StreamExpressionTest.java
+++ b/solr/solrj/src/test/org/apache/solr/client/solrj/io/stream/StreamExpressionTest.java
@@ -6287,8 +6287,10 @@ public class StreamExpressionTest extends SolrCloudTestCase {
     Map regression = (Map)tuple.get("regress");
     double slope = (double)regression.get("slope");
     double intercept= (double) regression.get("intercept");
+    double rSquare= (double) regression.get("RSquare");
     assertTrue(slope == 2.0D);
     assertTrue(intercept == 0.0D);
+    assertTrue(rSquare == 1.0D);
     double prediction = tuple.getDouble("p");
     assertTrue(prediction == 600.0D);
   }