diff --git a/compiler/util/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt b/compiler/util/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt
index 57e8921060f..dcc79b9140b 100644
--- a/compiler/util/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt
+++ b/compiler/util/src/org/jetbrains/kotlin/utils/JsLibraryUtils.kt
@@ -58,7 +58,6 @@ object JsLibraryUtils {
                 )
                 jsFile?.runIfFileExists(action)
             }
-            else -> throw IllegalArgumentException("Unknown library format (directory, zip or js file expected): $lib")
         }
     }