diff --git a/lib/galaxy/web/controllers/history.py b/lib/galaxy/web/controllers/history.py
index 9ad7d02b54a..5a804a8724b 100644
--- a/lib/galaxy/web/controllers/history.py
+++ b/lib/galaxy/web/controllers/history.py
@@ -454,7 +454,7 @@ class HistoryController( BaseController, Sharable, UsesAnnotations, UsesHistory
                 
                 # Security check: make sure that members are relative, not absolute.
                 for tarinfo in history_archive_file.getmembers():
-                    if tarinfo.name.startswith("/") or tarinfo.name.startswith(".."):
+                    if tarinfo.name.startswith("/") or tarinfo.name.find("..") != -1:
                         return trans.show_error_message( 'Error importing history archive: archive file is invalid.' )
                 
                 # Unpack archive in temporary directory.