diff --git a/sql/core/src/main/scala/org/apache/spark/sql/SparkSessionExtensions.scala b/sql/core/src/main/scala/org/apache/spark/sql/SparkSessionExtensions.scala
index 6b3744fe02d2..dc3dfaae4ff7 100644
--- a/sql/core/src/main/scala/org/apache/spark/sql/SparkSessionExtensions.scala
+++ b/sql/core/src/main/scala/org/apache/spark/sql/SparkSessionExtensions.scala
@@ -230,7 +230,7 @@ class SparkSessionExtensions {
    * cache hit rate by normalizing different plans to the same form. These rules should never modify
    * the result of the LogicalPlan.
    */
-  def injectPlanNormalizationRules(builder: RuleBuilder): Unit = {
+  def injectPlanNormalizationRule(builder: RuleBuilder): Unit = {
     planNormalizationRules += builder
   }
 
diff --git a/sql/core/src/test/scala/org/apache/spark/sql/SparkSessionExtensionSuite.scala b/sql/core/src/test/scala/org/apache/spark/sql/SparkSessionExtensionSuite.scala
index f5f04eabec03..66507756e892 100644
--- a/sql/core/src/test/scala/org/apache/spark/sql/SparkSessionExtensionSuite.scala
+++ b/sql/core/src/test/scala/org/apache/spark/sql/SparkSessionExtensionSuite.scala
@@ -194,7 +194,7 @@ class SparkSessionExtensionSuite extends SparkFunSuite with SQLHelper {
 
   test("inject plan normalization rules") {
     val extensions = create { extensions =>
-      extensions.injectPlanNormalizationRules { session =>
+      extensions.injectPlanNormalizationRule { session =>
         org.apache.spark.sql.catalyst.optimizer.PushDownPredicates
       }
     }