diff --git a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/JarUserDataManager.kt b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/JarUserDataManager.kt
index d093594acaa..5aa5a2c532d 100644
--- a/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/JarUserDataManager.kt
+++ b/idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/JarUserDataManager.kt
@@ -100,7 +100,6 @@ object JarUserDataManager {
 
     private fun storeUserData(counter: JarBooleanPropertyCounter, localJarFile: VirtualFile,
                               hasFileWithProperty: Boolean?, timestamp: Long? = null) {
-        assert(localJarFile.isInLocalFileSystem)
         assert((timestamp == null) == (hasFileWithProperty == null)) { "Using empty timestamp is only allowed for storing not counted value" }
 
         localJarFile.putUserData(counter.key,