diff --git a/js/js.config/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt b/js/js.config/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt
index 43fec00276d..806fcdd2d3a 100644
--- a/js/js.config/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt
+++ b/js/js.config/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -150,7 +150,7 @@ object JsLibraryUtils {
                         val relativePath = getSuggestedPath(entryName) ?: continue
 
                         val stream = zipFile.getInputStream(entry)
-                        val content = FileUtil.loadTextAndClose(stream)
+                        val content = stream.reader().readText()
                         librariesWithoutSourceMaps += JsLibrary(content, relativePath, null, null)
                     }
                     else if (entryName.endsWith(KotlinJavascriptMetadataUtils.JS_MAP_EXT)) {
@@ -166,7 +166,7 @@ object JsLibraryUtils {
                         val zipEntry = possibleMapFiles[it.path]
                         if (zipEntry != null) {
                             val stream = zipFile.getInputStream(zipEntry)
-                            val content = FileUtil.loadTextAndClose(stream)
+                            val content = stream.reader().readText()
                             it.copy(sourceMapContent = content)
                         }
                         else {