diff --git a/templates/repo_file_get.html b/templates/repo_file_get.html
index bbb72c3d57..a7a6b9740e 100644
--- a/templates/repo_file_get.html
+++ b/templates/repo_file_get.html
@@ -150,6 +150,6 @@
       });
       });
 {% endif %}
-{% if filetype == 'Unkown' %}
+{% if filetype == 'Unknown' %}
         $('#file-view').html('<p>该类型文件无法在线查看。<a href="{{ SITE_ROOT }}repo/{{ repo.id }}/{{ obj_id }}/?file_name={{ file_name }}&op=download">下载</a></p>');
 {% endif %}
diff --git a/utils.py b/utils.py
index 9d3b6e6cf2..c2b9bd1bb8 100644
--- a/utils.py
+++ b/utils.py
@@ -240,7 +240,7 @@ def valid_previewed_file(filename):
     
     """
     fileExt = os.path.splitext(filename)[1][1:]
-    return FILEEXT_TYPE_MAP.get(fileExt) or 'Unkown'
+    return FILEEXT_TYPE_MAP.get(fileExt) or 'Unknown'
 
 def get_file_revision_id_size (commit_id, path):
     """Given a commit and a file path in that commit, return the seafile id