diff --git a/src/sys/fileinfo.c b/src/sys/fileinfo.c
index c7658d48..aaaa2fb8 100644
--- a/src/sys/fileinfo.c
+++ b/src/sys/fileinfo.c
@@ -1897,6 +1897,10 @@ BOOLEAN FspFastIoQueryOpen(
     PFILE_OBJECT FileObject = IrpSp->FileObject;
     FSP_FSCTL_FILE_INFO FileInfoBuf;
 
+    if (0 != FileObject->RelatedFileObject)
+        /* sorry, no can do relative opens in here */
+        FSP_RETURN(Result = FALSE);
+
     Result = FspFileNodeTryGetFileInfoByName(IrpSp->DeviceObject, &FileObject->FileName, &FileInfoBuf);
     if (Result)
     {