diff --git a/platform/platform-api/src/com/intellij/openapi/vfs/VfsUtil.java b/platform/platform-api/src/com/intellij/openapi/vfs/VfsUtil.java
index 531eb4e34bd9..e4100a58f23e 100644
--- a/platform/platform-api/src/com/intellij/openapi/vfs/VfsUtil.java
+++ b/platform/platform-api/src/com/intellij/openapi/vfs/VfsUtil.java
@@ -499,7 +499,7 @@ public class VfsUtil extends VfsUtilCore {
         return prefix + ":///" + suffix;
       }
     }
-    else if (SystemInfoRt.isWindows && url.regionMatches(0, LocalFileSystem.PROTOCOL_PREFIX, 0, LocalFileSystem.PROTOCOL_PREFIX.length())) {
+    else if (url.charAt(index + 3) == '/' && SystemInfoRt.isWindows && url.regionMatches(0, LocalFileSystem.PROTOCOL_PREFIX, 0, LocalFileSystem.PROTOCOL_PREFIX.length())) {
       // file:///C:/test/file.js -> file://C:/test/file.js
       for (int i = index + 4; i < url.length(); i++) {
         char c = url.charAt(i);