diff --git a/src/lib/router.ts b/src/lib/router.ts
index 888c8eb24..655cfdd61 100644
--- a/src/lib/router.ts
+++ b/src/lib/router.ts
@@ -169,9 +169,10 @@ function extractBaseUrl(hostAndPort: string): BaseUrl {
     return {
       hostname,
       port: Number(port),
-      scheme: utils.isLocal(hostname)
-        ? "http"
-        : config.nodes.defaultHttpdScheme,
+      scheme:
+        utils.isLocal(hostname) || utils.isOnion(hostname)
+          ? "http"
+          : config.nodes.defaultHttpdScheme,
     };
   } else {
     return {
diff --git a/src/lib/utils.ts b/src/lib/utils.ts
index 8ed5d8bd1..017728969 100644
--- a/src/lib/utils.ts
+++ b/src/lib/utils.ts
@@ -264,6 +264,11 @@ export function isLocal(addr: string): boolean {
   );
 }
 
+// Check whether the given domain name is an onion domain name.
+export function isOnion(addr: string): boolean {
+  return addr.endsWith(".onion");
+}
+
 // Get the gravatar URL of an email.
 export function gravatarURL(email: string): string {
   const address = email.trim().toLowerCase();