diff --git a/docker-compose/nginx/default.conf b/docker-compose/nginx/default.conf
index f2ab099..5b63bf5 100644
--- a/docker-compose/nginx/default.conf
+++ b/docker-compose/nginx/default.conf
@@ -1,3 +1,8 @@
+map $http_x_forwarded_proto $fastcgi_param_https {
+    default '';
+    https 'on';
+}
+
 server {
     index dir2cast.php;
     server_name dir2cast;
@@ -27,5 +32,8 @@ server {
 
         # Security feature. See https://httpoxy.org/
         fastcgi_param HTTP_PROXY "";
+
+        # Make sure PHP knows we're using HTTPS
+        fastcgi_param HTTPS $fastcgi_param_https;
     }
 }