diff --git a/kyuubi-server/src/main/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilder.scala b/kyuubi-server/src/main/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilder.scala
index 716db0fcc54..77b9cd6d3b1 100644
--- a/kyuubi-server/src/main/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilder.scala
+++ b/kyuubi-server/src/main/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilder.scala
@@ -26,7 +26,7 @@ import scala.collection.mutable.{ArrayBuffer, ListBuffer}
 import com.google.common.annotations.VisibleForTesting
 
 import org.apache.kyuubi._
-import org.apache.kyuubi.config.KyuubiConf
+import org.apache.kyuubi.config.{KyuubiConf, KyuubiReservedKeys}
 import org.apache.kyuubi.config.KyuubiConf._
 import org.apache.kyuubi.config.KyuubiReservedKeys.KYUUBI_SESSION_USER_KEY
 import org.apache.kyuubi.engine.{ApplicationManagerInfo, KyuubiApplicationManager, ProcBuilder}
@@ -79,7 +79,8 @@ class FlinkProcessBuilder(
 
   override protected val commands: Array[String] = {
     KyuubiApplicationManager.tagApplication(engineRefId, shortName, clusterManager(), conf)
-
+    // unset engine credentials because Flink doesn't support them at the moment
+    conf.unset(KyuubiReservedKeys.KYUUBI_ENGINE_CREDENTIALS_KEY)
     // flink.execution.target are required in Kyuubi conf currently
     executionTarget match {
       case Some("yarn-application") =>
diff --git a/kyuubi-server/src/test/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilderSuite.scala b/kyuubi-server/src/test/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilderSuite.scala
index 25295c37431..990d56f15c4 100644
--- a/kyuubi-server/src/test/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilderSuite.scala
+++ b/kyuubi-server/src/test/scala/org/apache/kyuubi/engine/flink/FlinkProcessBuilderSuite.scala
@@ -27,6 +27,7 @@ import scala.util.matching.Regex
 import org.apache.kyuubi.KyuubiFunSuite
 import org.apache.kyuubi.config.KyuubiConf
 import org.apache.kyuubi.config.KyuubiConf.{ENGINE_FLINK_APPLICATION_JARS, ENGINE_FLINK_EXTRA_CLASSPATH, ENGINE_FLINK_JAVA_OPTIONS, ENGINE_FLINK_MEMORY}
+import org.apache.kyuubi.config.KyuubiReservedKeys.KYUUBI_ENGINE_CREDENTIALS_KEY
 import org.apache.kyuubi.engine.flink.FlinkProcessBuilder._
 
 class FlinkProcessBuilderSuite extends KyuubiFunSuite {
@@ -37,12 +38,14 @@ class FlinkProcessBuilderSuite extends KyuubiFunSuite {
     .set(
       ENGINE_FLINK_JAVA_OPTIONS,
       "-agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=5005")
+    .set(KYUUBI_ENGINE_CREDENTIALS_KEY, "should-not-be-used")
 
   private def applicationModeConf = KyuubiConf()
     .set("flink.execution.target", "yarn-application")
     .set(ENGINE_FLINK_APPLICATION_JARS, tempUdfJar.toString)
     .set(APP_KEY, "kyuubi_connection_flink_paul")
     .set("kyuubi.on", "off")
+    .set(KYUUBI_ENGINE_CREDENTIALS_KEY, "should-not-be-used")
 
   private val tempFlinkHome = Files.createTempDirectory("flink-home").toFile
   private val tempOpt =
@@ -65,6 +68,7 @@ class FlinkProcessBuilderSuite extends KyuubiFunSuite {
     (FLINK_HADOOP_CLASSPATH_KEY -> s"${File.separator}hadoop")
   private def confStr: String = {
     sessionModeConf.clone.getAll
+      .filter(!_._1.equals(KYUUBI_ENGINE_CREDENTIALS_KEY))
       .map { case (k, v) => s"\\\\\\n\\t--conf $k=$v" }
       .mkString(" ")
   }