diff --git a/data/templates/nginx/yunohost_api.conf.inc b/data/templates/nginx/yunohost_api.conf.inc
index 307eb4aa..35cd0090 100644
--- a/data/templates/nginx/yunohost_api.conf.inc
+++ b/data/templates/nginx/yunohost_api.conf.inc
@@ -4,4 +4,14 @@ location /yunohost/api/ {
     proxy_http_version 1.1;
     proxy_set_header Upgrade $http_upgrade;
     proxy_set_header Connection "upgrade";
+
+    # Custom 502 error page
+    error_page 502 /yunohost/api/error/502;
+}
+
+# Yunohost admin output complete 502 error page, so use only plain text.
+location = /yunohost/api/error/502 {
+    return 502 '502 - Bad Gateway';
+    add_header Content-Type text/plain;
+    internal;
 }