diff --git a/src/main/scala/org/apache/spark/sql/catalyst/expressions/RandGamma.scala b/src/main/scala/org/apache/spark/sql/catalyst/expressions/RandGamma.scala
index 8085068..bcbcd0c 100644
--- a/src/main/scala/org/apache/spark/sql/catalyst/expressions/RandGamma.scala
+++ b/src/main/scala/org/apache/spark/sql/catalyst/expressions/RandGamma.scala
@@ -2,13 +2,15 @@ package org.apache.spark.sql.catalyst.expressions
 
 import org.apache.commons.math3.distribution.GammaDistribution
 import org.apache.spark.sql.catalyst.InternalRow
+import org.apache.spark.sql.catalyst.expressions.RandGamma.defaultSeedExpression
 import org.apache.spark.sql.catalyst.expressions.codegen.FalseLiteral
 import org.apache.spark.sql.catalyst.expressions.codegen.Block.BlockHelper
 import org.apache.spark.sql.catalyst.expressions.codegen.{CodeGenerator, CodegenContext, ExprCode}
 import org.apache.spark.sql.types._
+import org.apache.spark.util.Utils
 import org.apache.spark.util.random.XORShiftRandomAdapted
 
-import scala.util.Try
+import scala.util.{Success, Try}
 
 case class RandGamma(child: Expression, shape: Expression, scale: Expression, hideSeed: Boolean = false)
     extends TernaryExpression
@@ -40,7 +42,7 @@ case class RandGamma(child: Expression, shape: Expression, scale: Expression, hi
   }
   @transient private var distribution: GammaDistribution = _
 
-  def this() = this(Try(org.apache.spark.sql.catalyst.analysis.UnresolvedSeed).getOrElse(Literal(42L, LongType)), Literal(1.0, DoubleType), Literal(1.0, DoubleType), true)
+  def this() = this(defaultSeedExpression, Literal(1.0, DoubleType), Literal(1.0, DoubleType), true)
 
   def this(child: Expression, shape: Expression, scale: Expression) = this(child, shape, scale, false)
 
@@ -84,4 +86,9 @@ case class RandGamma(child: Expression, shape: Expression, scale: Expression, hi
 object RandGamma {
   def apply(seed: Long, shape: Double, scale: Double): RandGamma =
     RandGamma(Literal(seed, LongType), Literal(shape, DoubleType), Literal(scale, DoubleType))
+
+  def defaultSeedExpression: Expression = Try(Class.forName("org.apache.spark.sql.catalyst.analysis.UnresolvedSeed")) match {
+    case Success(clazz) => clazz.getConstructor().newInstance().asInstanceOf[Expression]
+    case _ => Literal(Utils.random.nextLong(), LongType)
+  }
 }