diff --git a/formats/json/jsMain/src/kotlinx/serialization/json/internal/IntelliJAnnotation.kt b/formats/json/jsMain/src/kotlinx/serialization/json/internal/IntelliJAnnotation.kt
deleted file mode 100644
index ab81e5be8..000000000
--- a/formats/json/jsMain/src/kotlinx/serialization/json/internal/IntelliJAnnotation.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * Copyright 2017-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
- */
-
-@file:Suppress("PackageDirectoryMismatch")
-
-package org.intellij.lang.annotations
-
-import kotlinx.serialization.InternalSerializationApi
-
-/**
- * JS implementation of JVM-only `org.intellij.lang.annotations.Language` class, adds syntax support by IDE.
- *
- * This class is missing from the Kotlin/JS targets, so it needs to be distributed along with the serialization runtime.
- *
- * Copy-paste from [https://github.com/JetBrains/java-annotations](https://github.com/JetBrains/java-annotations).
- *
- * @see [kotlinx.serialization.json.internal.FormatLanguage]
- */
-@InternalSerializationApi
-@Retention(AnnotationRetention.BINARY)
-@Target(
-    AnnotationTarget.FUNCTION,
-    AnnotationTarget.PROPERTY_GETTER,
-    AnnotationTarget.PROPERTY_SETTER,
-    AnnotationTarget.FIELD,
-    AnnotationTarget.VALUE_PARAMETER,
-    AnnotationTarget.LOCAL_VARIABLE,
-    AnnotationTarget.ANNOTATION_CLASS,
-)
-public annotation class Language(
-    val value: String,
-    val prefix: String = "",
-    val suffix: String = "",
-)
diff --git a/formats/json/nativeMain/src/kotlinx/serialization/json/internal/IntelliJAnnotation.kt b/formats/json/nativeMain/src/kotlinx/serialization/json/internal/IntelliJAnnotation.kt
deleted file mode 100644
index 8bf11d370..000000000
--- a/formats/json/nativeMain/src/kotlinx/serialization/json/internal/IntelliJAnnotation.kt
+++ /dev/null
@@ -1,35 +0,0 @@
-/*
- * Copyright 2017-2023 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license.
- */
-
-@file:Suppress("PackageDirectoryMismatch")
-
-package org.intellij.lang.annotations
-
-import kotlinx.serialization.InternalSerializationApi
-
-/**
- * Native implementation of JVM-only `org.intellij.lang.annotations.Language` class, adds syntax support by IDE.
- *
- * This class is missing from the Kotlin/Native targets, so it needs to be distributed along with the serialization runtime.
- *
- * Copy-paste from [https://github.com/JetBrains/java-annotations](https://github.com/JetBrains/java-annotations).
- *
- * @see [kotlinx.serialization.json.internal.FormatLanguage]
- */
-@InternalSerializationApi
-@Retention(AnnotationRetention.BINARY)
-@Target(
-    AnnotationTarget.FUNCTION,
-    AnnotationTarget.PROPERTY_GETTER,
-    AnnotationTarget.PROPERTY_SETTER,
-    AnnotationTarget.FIELD,
-    AnnotationTarget.VALUE_PARAMETER,
-    AnnotationTarget.LOCAL_VARIABLE,
-    AnnotationTarget.ANNOTATION_CLASS,
-)
-public annotation class Language(
-    val value: String,
-    val prefix: String = "",
-    val suffix: String = "",
-)
\ No newline at end of file