diff --git a/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt b/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
index 743c04bd33f..5568133afa7 100644
--- a/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
+++ b/java/kotlin-extractor/src/main/kotlin/KotlinFileExtractor.kt
@@ -41,7 +41,7 @@ open class KotlinFileExtractor(
     globalExtensionState: KotlinExtractorGlobalState
 ): KotlinUsesExtractor(logger, tw, dependencyCollector, externalClassExtractor, primitiveTypeMapping, pluginContext, globalExtensionState) {
 
-    inline fun <T> with(kind: String, element: IrElement, f: () -> T): T {
+    private inline fun <T> with(kind: String, element: IrElement, f: () -> T): T {
         val name = when (element) {
             is IrFile -> element.name
             is IrDeclarationWithName -> element.name.asString()
@@ -2192,7 +2192,7 @@ open class KotlinFileExtractor(
         }
     }
 
-    fun getStatementOriginOperator(origin: IrStatementOrigin?) = when (origin) {
+    private fun getStatementOriginOperator(origin: IrStatementOrigin?) = when (origin) {
         IrStatementOrigin.PLUSEQ -> "plus"
         IrStatementOrigin.MINUSEQ -> "minus"
         IrStatementOrigin.MULTEQ -> "times"
diff --git a/java/kotlin-extractor/src/main/kotlin/KotlinUsesExtractor.kt b/java/kotlin-extractor/src/main/kotlin/KotlinUsesExtractor.kt
index b5fcad1372d..a67fa9e91ef 100644
--- a/java/kotlin-extractor/src/main/kotlin/KotlinUsesExtractor.kt
+++ b/java/kotlin-extractor/src/main/kotlin/KotlinUsesExtractor.kt
@@ -190,7 +190,7 @@ open class KotlinUsesExtractor(
         }
 
     // The Kotlin compiler internal representation of Outer<A, B>.Inner<C, D>.InnerInner<E, F>.someFunction<G, H>.LocalClass<I, J> is LocalClass<I, J, G, H, E, F, C, D, A, B>. This function returns [A, B, C, D, E, F, G, H, I, J].
-    fun orderTypeArgsLeftToRight(c: IrClass, argsIncludingOuterClasses: List<IrTypeArgument>?): List<IrTypeArgument>? {
+    private fun orderTypeArgsLeftToRight(c: IrClass, argsIncludingOuterClasses: List<IrTypeArgument>?): List<IrTypeArgument>? {
         if(argsIncludingOuterClasses.isNullOrEmpty())
             return argsIncludingOuterClasses
         val ret = ArrayList<IrTypeArgument>()
@@ -237,7 +237,7 @@ open class KotlinUsesExtractor(
         return UseClassInstanceResult(classTypeResult, extractClass)
     }
 
-    fun isArray(t: IrSimpleType) = t.isBoxedArray || t.isPrimitiveArray()
+    private fun isArray(t: IrSimpleType) = t.isBoxedArray || t.isPrimitiveArray()
 
     fun extractClassLaterIfExternal(c: IrClass) {
         if (isExternalDeclaration(c)) {
@@ -1464,7 +1464,7 @@ open class KotlinUsesExtractor(
         return t
     }
 
-    fun eraseTypeParameter(t: IrTypeParameter) =
+    private fun eraseTypeParameter(t: IrTypeParameter) =
         erase(t.superTypes[0])
 
     /**
diff --git a/java/kotlin-extractor/src/main/kotlin/utils/AutoCloseableUse.kt b/java/kotlin-extractor/src/main/kotlin/utils/AutoCloseableUse.kt
index fe68f308893..dad820ab6ee 100644
--- a/java/kotlin-extractor/src/main/kotlin/utils/AutoCloseableUse.kt
+++ b/java/kotlin-extractor/src/main/kotlin/utils/AutoCloseableUse.kt
@@ -40,4 +40,4 @@ fun AutoCloseable?.closeFinallyAC(cause: Throwable?) = when {
       } catch (closeException: Throwable) {
           cause.addSuppressed(closeException)
       }
-}
\ No newline at end of file
+}
diff --git a/java/kotlin-extractor/src/main/kotlin/utils/Logger.kt b/java/kotlin-extractor/src/main/kotlin/utils/Logger.kt
index 169ba389c9a..ca27217ac6c 100644
--- a/java/kotlin-extractor/src/main/kotlin/utils/Logger.kt
+++ b/java/kotlin-extractor/src/main/kotlin/utils/Logger.kt
@@ -226,7 +226,7 @@ open class Logger(val loggerBase: LoggerBase, open val tw: TrapWriter) {
         loggerBase.info(tw, msg)
     }
 
-    fun warn(msg: String, extraInfo: String?) {
+    private fun warn(msg: String, extraInfo: String?) {
         loggerBase.warn(tw, msg, extraInfo)
     }
     fun warn(msg: String, exn: Throwable) {
@@ -236,7 +236,7 @@ open class Logger(val loggerBase: LoggerBase, open val tw: TrapWriter) {
         warn(msg, null)
     }
 
-    fun error(msg: String, extraInfo: String?) {
+    private fun error(msg: String, extraInfo: String?) {
         loggerBase.error(tw, msg, extraInfo)
     }
     fun error(msg: String) {