diff --git a/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java b/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
index 012bb098f6fc46ee99959c1d479e87cf163e7bc5..fa050363b139a5b6bad83f2be29fa6f7a7df10ac 100644
--- a/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
+++ b/common/network-common/src/main/java/org/apache/spark/network/util/TransportConf.java
@@ -24,11 +24,6 @@ import com.google.common.primitives.Ints;
  */
 public class TransportConf {
 
-  static {
-    // Set this due to Netty PR #5661 for Netty 4.0.37+ to work
-    System.setProperty("io.netty.maxDirectMemory", "0");
-  }
-
   private final String SPARK_NETWORK_IO_MODE_KEY;
   private final String SPARK_NETWORK_IO_PREFERDIRECTBUFS_KEY;
   private final String SPARK_NETWORK_IO_CONNECTIONTIMEOUT_KEY;