diff --git a/calmerge/__init__.py b/calmerge/__init__.py
index cd38bf2..42236c3 100644
--- a/calmerge/__init__.py
+++ b/calmerge/__init__.py
@@ -1,6 +1,8 @@
+import os
 from pathlib import Path
 
 import aiohttp_jinja2
+import aiohttp_remotes
 from aiohttp import web
 from jinja2 import FileSystemLoader
 
@@ -22,6 +24,12 @@ def get_aiohttp_app(config: Config) -> web.Application:
         ],
     )
 
+    app.middlewares.append(
+        aiohttp_remotes.XForwardedRelaxed(
+            num=int(os.environ.get("X_FORWARDED_NUM", 1))
+        ).middleware
+    )
+
     jinja2_env.filters["calendar_url"] = templates.calendar_url
 
     app["config"] = config
diff --git a/poetry.lock b/poetry.lock
index 8d74242..4ceb327 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -126,6 +126,21 @@ files = [
 aiohttp = ">=3.9.0"
 jinja2 = ">=3.0.0"
 
+[[package]]
+name = "aiohttp-remotes"
+version = "1.2.0"
+description = "Control remote side information."
+optional = false
+python-versions = ">=3.6"
+files = [
+    {file = "aiohttp_remotes-1.2.0-py3-none-any.whl", hash = "sha256:1bc2b11b285b82fab920cc774b8778128d4666e6f6628d6664dfba705ffda062"},
+    {file = "aiohttp_remotes-1.2.0.tar.gz", hash = "sha256:f95c3a6be5e2de746a85ce9af49ec548da6db8378d7e81bb171ec77b13562a6c"},
+]
+
+[package.dependencies]
+aiohttp = ">=3.8.1"
+typing-extensions = ">=3.7.4"
+
 [[package]]
 name = "aiosignal"
 version = "1.3.1"
@@ -1000,4 +1015,4 @@ multidict = ">=4.0"
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.11"
-content-hash = "359971f91a76ec8f9a13bf997ca02af8e0995f07c134ca80b1606e3df01e2d65"
+content-hash = "28b6b10d94a08f82c17f6f531ef0d1969a5f66b6a67c19cecd82c3f5a52c209c"
diff --git a/pyproject.toml b/pyproject.toml
index fdd169a..2717a3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -14,6 +14,7 @@ icalendar = "^5.0.11"
 aiocache = "^0.12.2"
 aiohttp-jinja2 = "^1.6"
 
+aiohttp-remotes = "^1.2.0"
 [tool.poetry.group.dev.dependencies]
 ruff = "^0.3.2"
 pytest = "^8.1.1"