diff --git a/phpseclib/Math/BigInteger/Engines/BCMath.php b/phpseclib/Math/BigInteger/Engines/BCMath.php
index b9739243..08273490 100644
--- a/phpseclib/Math/BigInteger/Engines/BCMath.php
+++ b/phpseclib/Math/BigInteger/Engines/BCMath.php
@@ -514,8 +514,6 @@ class BCMath extends Engine
      */
     protected function normalize(BCMath $result)
     {
-        unset($result->reduce);
-
         $result->precision = $this->precision;
         $result->bitmask = $this->bitmask;
 
diff --git a/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php b/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php
index 27530ec7..35a3f313 100644
--- a/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php
+++ b/phpseclib/Math/BigInteger/Engines/BCMath/Reductions/EvalBarrett.php
@@ -59,11 +59,6 @@ abstract class EvalBarrett extends Base
      */
     protected static function generateCustomReduction(BCMath $m, $class)
     {
-        if (isset($n->reduce)) {
-            self::$custom_reduction = $n->reduce;
-            return $n->reduce;
-        }
-
         $m_length = strlen($m);
 
         if ($m_length < 5) {
diff --git a/phpseclib/Math/BigInteger/Engines/Engine.php b/phpseclib/Math/BigInteger/Engines/Engine.php
index 17b1996c..fd9eb828 100644
--- a/phpseclib/Math/BigInteger/Engines/Engine.php
+++ b/phpseclib/Math/BigInteger/Engines/Engine.php
@@ -1081,20 +1081,18 @@ abstract class Engine
             static::$modexpEngine;
         if (method_exists($fqengine, 'generateCustomReduction')) {
             $func = $fqengine::generateCustomReduction($this, static::class);
-            $this->reduce = eval('return function(' . static::class . ' $x) use ($func, $class) {
+            return eval('return function(' . static::class . ' $x) use ($func, $class) {
                 $r = new $class();
                 $r->value = $func($x->value);
                 return $r;
             };');
-            return clone $this->reduce;
         }
         $n = $this->value;
-        $this->reduce = eval('return function(' . static::class . ' $x) use ($n, $fqengine, $class) {
+        return eval('return function(' . static::class . ' $x) use ($n, $fqengine, $class) {
             $r = new $class();
             $r->value = $fqengine::reduce($x->value, $n, $class);
             return $r;
         };');
-        return clone $this->reduce;
     }
 
     /**
diff --git a/phpseclib/Math/BigInteger/Engines/GMP.php b/phpseclib/Math/BigInteger/Engines/GMP.php
index 2cbc9cbe..74272da8 100644
--- a/phpseclib/Math/BigInteger/Engines/GMP.php
+++ b/phpseclib/Math/BigInteger/Engines/GMP.php
@@ -512,8 +512,6 @@ class GMP extends Engine
      */
     protected function normalize(GMP $result)
     {
-        unset($result->reduce);
-
         $result->precision = $this->precision;
         $result->bitmask = $this->bitmask;
 
@@ -683,10 +681,9 @@ class GMP extends Engine
     public function createRecurringModuloFunction()
     {
         $temp = $this->value;
-        $this->reduce = function(GMP $x) use ($temp) {
+        return function(GMP $x) use ($temp) {
             return new GMP($x->value % $temp);
         };
-        return $this->reduce;
     }
 
     /**
diff --git a/phpseclib/Math/BigInteger/Engines/PHP.php b/phpseclib/Math/BigInteger/Engines/PHP.php
index 5f94e68b..63705f9f 100644
--- a/phpseclib/Math/BigInteger/Engines/PHP.php
+++ b/phpseclib/Math/BigInteger/Engines/PHP.php
@@ -731,8 +731,6 @@ abstract class PHP extends Engine
      */
     protected function normalize(PHP $result)
     {
-        unset($result->reduce);
-
         $result->precision = $this->precision;
         $result->bitmask = $this->bitmask;
 
diff --git a/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php b/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php
index 7c81071d..c9f82c70 100644
--- a/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php
+++ b/phpseclib/Math/BigInteger/Engines/PHP/Reductions/EvalBarrett.php
@@ -60,11 +60,6 @@ abstract class EvalBarrett extends Base
      */
     protected static function generateCustomReduction(PHP $m, $class)
     {
-        if (isset($n->reduce)) {
-            self::$custom_reduction = $n->reduce;
-            return $n->reduce;
-        }
-
         $m_length = count($m->value);
 
         if ($m_length < 5) {