diff --git a/idea/src/org/jetbrains/jet/plugin/imports/KotlinImportOptimizer.kt b/idea/src/org/jetbrains/jet/plugin/imports/KotlinImportOptimizer.kt
index 0a5b3f97f38..5cbb3928a39 100644
--- a/idea/src/org/jetbrains/jet/plugin/imports/KotlinImportOptimizer.kt
+++ b/idea/src/org/jetbrains/jet/plugin/imports/KotlinImportOptimizer.kt
@@ -41,7 +41,7 @@ public class KotlinImportOptimizer() : ImportOptimizer {
         val directives = jetFile.getImportDirectives()
 
         val directivesBeforeCurrent = ArrayList<JetImportDirective>()
-        val directivesAfterCurrent = jetFile.getImportDirectives()
+        val directivesAfterCurrent = ArrayList(jetFile.getImportDirectives())
 
         ApplicationManager.getApplication()!!.runWriteAction(Runnable {
             // Remove only unnecessary imports