diff --git a/canaille/account.py b/canaille/account.py
index 10111896..caa55f98 100644
--- a/canaille/account.py
+++ b/canaille/account.py
@@ -1,10 +1,8 @@
-import base64
 import email.message
 import hashlib
 import pkg_resources
 import logging
 import smtplib
-import urllib.request
 
 from flask import (
     Blueprint,
@@ -25,6 +23,7 @@ from .forms import (
     PasswordResetForm,
     ForgottenPasswordForm,
 )
+from .apputils import base64logo
 from .flaskutils import current_user, user_needed, moderator_needed
 from .models import User
 
@@ -227,15 +226,7 @@ def forgotten():
         hash=profile_hash(user.uid[0], user.userPassword[0]),
         _external=True,
     )
-    logo = None
-    logo_extension = None
-    if current_app.config.get("LOGO"):
-        logo_extension = current_app.config["LOGO"].split(".")[-1]
-        try:
-            with urllib.request.urlopen(current_app.config.get("LOGO")) as f:
-                logo = base64.b64encode(f.read()).decode("utf-8")
-        except (urllib.error.HTTPError, urllib.error.URLError):
-            pass
+    logo, logo_extension = base64logo()
 
     subject = _("Password reset on {website_name}").format(
         website_name=current_app.config.get("NAME", reset_url)
diff --git a/canaille/apputils.py b/canaille/apputils.py
new file mode 100644
index 00000000..b9a91f99
--- /dev/null
+++ b/canaille/apputils.py
@@ -0,0 +1,29 @@
+import base64
+import urllib.request
+from flask import current_app, request
+
+
+def base64logo():
+    logo_url = current_app.config.get("LOGO")
+    if not logo_url:
+        return None, None
+
+    logo_extension = logo_url.split(".")[-1]
+    if not logo_url.startswith("http"):
+        if current_app.config.get("SERVER_NAME"):
+            logo_url = "{}://{}/{}".format(
+                current_app.config.get("PREFERRED_URL_SCHEME"),
+                current_app.config.get("SERVER_NAME"),
+                logo_url,
+            )
+        else:
+            logo_url = "{}{}".format(request.url_root, logo_url)
+
+    try:
+        with urllib.request.urlopen(logo_url) as f:
+            logo = base64.b64encode(f.read()).decode("utf-8")
+    except (urllib.error.HTTPError, urllib.error.URLError):
+        logo = None
+        logo_extension = None
+
+    return logo, logo_extension