diff --git a/rand/rand_test.go b/rand/rand_test.go
index 4383e4fb2..276a55fb5 100644
--- a/rand/rand_test.go
+++ b/rand/rand_test.go
@@ -78,7 +78,7 @@ func checkSampleDistribution(t *testing.T, samples []float64, expected *statsRes
 	actual := getStatsResults(samples)
 	err := actual.checkSimilarDistribution(expected)
 	if err != nil {
-		t.Errorf(err.Error())
+		t.Error(err)
 	}
 }