diff --git a/platform/core-impl/src/org/jetbrains/ide/script/Jsr223IdeScriptEngineManagerImpl.java b/platform/core-impl/src/org/jetbrains/ide/script/Jsr223IdeScriptEngineManagerImpl.java
index 5880beab105f..48a751d27dd4 100644
--- a/platform/core-impl/src/org/jetbrains/ide/script/Jsr223IdeScriptEngineManagerImpl.java
+++ b/platform/core-impl/src/org/jetbrains/ide/script/Jsr223IdeScriptEngineManagerImpl.java
@@ -237,6 +237,8 @@ class Jsr223IdeScriptEngineManagerImpl extends IdeScriptEngineManager {
 
     public AllPluginsLoader() {
       // Groovy performance: do not specify parent loader to enable our luckyGuesser
+      // Also specify null explicitly to suppress getSystemClassLoader() as parent
+      super(null);
     }
 
     @Override