diff --git a/java/java-tests/testSrc/com/intellij/java/openapi/roots/impl/DirectoryIndexTest.java b/java/java-tests/testSrc/com/intellij/java/openapi/roots/impl/DirectoryIndexTest.java
index 60a4ac26fbe2..adcf4b8567ab 100644
--- a/java/java-tests/testSrc/com/intellij/java/openapi/roots/impl/DirectoryIndexTest.java
+++ b/java/java-tests/testSrc/com/intellij/java/openapi/roots/impl/DirectoryIndexTest.java
@@ -167,12 +167,7 @@ public class DirectoryIndexTest extends DirectoryIndexTestCase {
                                                     Arrays.asList(myExcludedLibClsDir.getUrl(), myExcludedLibSrcDir.getUrl()), DependencyScope.COMPILE, true);
       }
 
-      for (AdditionalLibraryRootsProvider provider : AdditionalLibraryRootsProvider.EP_NAME.getExtensions()) {
-        for (SyntheticLibrary library : provider.getAdditionalProjectLibraries(getProject())) {
-          myLibAdditionalSrcDirs.addAll(library.getSourceRoots());
-          myLibAdditionalClsDirs.addAll(library.getBinaryRoots());
-        }
-      }
+      PlatformTestUtil.unregisterAllExtensions(AdditionalLibraryRootsProvider.EP_NAME, getTestRootDisposable());
       PlatformTestUtil.registerExtension(AdditionalLibraryRootsProvider.EP_NAME, new AdditionalLibraryRootsProvider() {
         @NotNull
         @Override
diff --git a/platform/testFramework/src/com/intellij/testFramework/PlatformTestUtil.java b/platform/testFramework/src/com/intellij/testFramework/PlatformTestUtil.java
index ac9d935fc6da..9401af23b1cb 100644
--- a/platform/testFramework/src/com/intellij/testFramework/PlatformTestUtil.java
+++ b/platform/testFramework/src/com/intellij/testFramework/PlatformTestUtil.java
@@ -135,6 +135,13 @@ public class PlatformTestUtil {
     Disposer.register(parentDisposable, () -> extensionPoint.unregisterExtension(t));
   }
 
+  public static <T> void unregisterAllExtensions(@NotNull ExtensionPointName<T> name, @NotNull Disposable parentDisposable) {
+    ExtensionPoint<T> extensionPoint = Extensions.getRootArea().getExtensionPoint(name.getName());
+    T[] extensions = name.getExtensions();
+    Arrays.stream(extensions).forEach(extensionPoint::unregisterExtension);
+    Disposer.register(parentDisposable, () -> Arrays.stream(extensions).forEach(extensionPoint::registerExtension));
+  }
+
   @Nullable
   public static String toString(@Nullable Object node, @Nullable Queryable.PrintInfo printInfo) {
     if (node instanceof AbstractTreeNode) {