diff --git a/pagure/ui/repo.py b/pagure/ui/repo.py
index c447382..aecdaf2 100644
--- a/pagure/ui/repo.py
+++ b/pagure/ui/repo.py
@@ -1300,9 +1300,9 @@ def edit_file(repo, branchname, filename, username=None):
             repo_obj, commit.tree, filename.split('/'))
         if not content or isinstance(content, pygit2.Tree):
             flask.abort(404, 'File not found')
-        if content.is_binary:
-            flask.abort(400, 'Cannot edit binary files')
         data = repo_obj[content.oid].data
+        if content.is_binary or pagure.lib.is_binary(data):
+            flask.abort(400, 'Cannot edit binary files')
     else:
         data = form.content.data