diff --git a/gradle/kotlin.gradle b/gradle/kotlin.gradle
index 838af1f3..376f2c7a 100644
--- a/gradle/kotlin.gradle
+++ b/gradle/kotlin.gradle
@@ -15,6 +15,7 @@ allprojects {
 
     allOpen {
         annotation("jakarta.persistence.Entity")
+        annotation("javax.persistence.Entity")
     }
 
     dependencies {
diff --git a/src/main/kotlin/me/nalab/api/survey/domain/survey/FormQuestionable.kt b/src/main/kotlin/me/nalab/api/survey/domain/survey/FormQuestionable.kt
index 7c39af9c..191f5780 100644
--- a/src/main/kotlin/me/nalab/api/survey/domain/survey/FormQuestionable.kt
+++ b/src/main/kotlin/me/nalab/api/survey/domain/survey/FormQuestionable.kt
@@ -8,21 +8,21 @@ import javax.persistence.*
 abstract class FormQuestionable(
     @Id
     @Column(name = "form_question_id")
-    open val id: Long,
+    val id: Long,
 
     @Column(name = "title", nullable = false, length = 45)
-    open val title: String,
+    val title: String,
 
     @Column(name = "orders", nullable = false)
-    open val order: Int,
+    val order: Int,
 
     @Enumerated(EnumType.STRING)
     @Column(name = "question_type")
-    open val questionType: QuestionType,
+    val questionType: QuestionType,
 
     @ManyToOne(fetch = FetchType.LAZY)
     @JoinColumn(name = "survey_id", nullable = false)
-    open val survey: Survey,
+    val survey: Survey,
 ) : Comparable<FormQuestionable>, TimeBaseEntity() {
 
     override fun compareTo(other: FormQuestionable): Int = this.order.compareTo(other.order)