diff --git a/tests/csrf_tests/views.py b/tests/csrf_tests/views.py
index 89d1189e0d..41bcb07ed6 100644
--- a/tests/csrf_tests/views.py
+++ b/tests/csrf_tests/views.py
@@ -9,7 +9,7 @@ def post_form_view(request):
     """Return a POST form (without a token)."""
     return HttpResponse(content="""
 <html><body><h1>\u00a1Unicode!<form method="post"><input type="text"></form></body></html>
-""", mimetype='text/html')
+""")
 
 
 @ensure_csrf_cookie
