diff --git a/python/nav/web/auth/middleware.py b/python/nav/web/auth/middleware.py
index ed46f07bf1..8c6bc9f0e5 100644
--- a/python/nav/web/auth/middleware.py
+++ b/python/nav/web/auth/middleware.py
@@ -30,6 +30,7 @@
     authorization_not_required,
 )
 from nav.web.auth.sudo import get_sudoer
+from nav.web.utils import is_ajax
 
 
 _logger = logging.getLogger(__name__)
@@ -107,7 +108,7 @@ def redirect_to_login(self, request):
         response.
 
         """
-        if request.is_ajax():
+        if is_ajax(request):
             return HttpResponse(status=401)
 
         new_url = get_login_url(request)
diff --git a/python/nav/web/syslogger/views.py b/python/nav/web/syslogger/views.py
index 16f30a1378..068f7c04f9 100644
--- a/python/nav/web/syslogger/views.py
+++ b/python/nav/web/syslogger/views.py
@@ -32,7 +32,7 @@
 from nav.models.logger import LogMessage
 from nav.models.logger import ErrorError
 from nav.web.syslogger.forms import LoggerGroupSearchForm
-from nav.web.utils import create_title
+from nav.web.utils import create_title, is_ajax
 
 
 DATEFORMAT = "%Y-%m-%d %H:%M:%S"
@@ -204,7 +204,7 @@ def index(request):
 
 
 def group_search(request):
-    if not request.is_ajax():
+    if not is_ajax(request):
         return HttpResponseRedirect(reverse(index) + '?' + request.GET.urlencode())
     return handle_search(request, LoggerGroupSearchForm, reverse(group_search))
 
@@ -213,7 +213,7 @@ def exceptions_response(request):
     """
     Handler for exception-mode.
     """
-    if not request.is_ajax():
+    if not is_ajax(request):
         return HttpResponseRedirect(reverse(index) + '?' + request.GET.urlencode())
 
     account = get_account(request)
@@ -236,7 +236,7 @@ def errors_response(request):
     """
     Handler for error-mode.
     """
-    if not request.is_ajax():
+    if not is_ajax(request):
         return HttpResponseRedirect(reverse(index) + '?' + request.GET.urlencode())
 
     account = get_account(request)
diff --git a/python/nav/web/utils.py b/python/nav/web/utils.py
index f5abb163c6..3016f016fe 100644
--- a/python/nav/web/utils.py
+++ b/python/nav/web/utils.py
@@ -26,6 +26,10 @@
 import qrcode.image.pil
 
 
+def is_ajax(request):
+    return request.headers.get("x-requested-with") == "XMLHttpRequest"
+
+
 def get_navpath_root():
     """Returns the default navpath root