diff --git a/plugins/testng/src/com/theoryinpractice/testng/util/TestNGUtil.java b/plugins/testng/src/com/theoryinpractice/testng/util/TestNGUtil.java
index d87d4fb28426..5f9a88bc112f 100644
--- a/plugins/testng/src/com/theoryinpractice/testng/util/TestNGUtil.java
+++ b/plugins/testng/src/com/theoryinpractice/testng/util/TestNGUtil.java
@@ -536,7 +536,7 @@ public class TestNGUtil {
   }
 
   public static boolean isTestngXML(final VirtualFile virtualFile) {
-    if ("xml".equalsIgnoreCase(virtualFile.getExtension()) && virtualFile.isValid()) {
+    if ("xml".equalsIgnoreCase(virtualFile.getExtension()) && virtualFile.isInLocalFileSystem() && virtualFile.isValid()) {
       final String result = NanoXmlUtil.parseHeader(virtualFile).getRootTagLocalName();
       if (result != null && result.equals(SUITE_TAG_NAME)) {
         return true;