diff --git a/CHANGELOG.md b/CHANGELOG.md
index 23c53b3f08..40a7b61d10 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,8 @@ the release.
   ([#1610](https://github.com/open-telemetry/opentelemetry-demo/pull/1610))
 * [Valkey] Replace Redis with Valkey
   ([#1619](https://github.com/open-telemetry/opentelemetry-demo/pull/1619))
+* [frontend] fixed default flagd port for HTTPS connections
+  ([#1609](https://github.com/open-telemetry/opentelemetry-demo/pull/1609))
 
 ## 1.10.0
 
diff --git a/src/frontend/pages/_app.tsx b/src/frontend/pages/_app.tsx
index 00a7e696b5..e49b51f7c6 100755
--- a/src/frontend/pages/_app.tsx
+++ b/src/frontend/pages/_app.tsx
@@ -37,12 +37,19 @@ if (typeof window !== 'undefined') {
        * We connect to flagd through the envoy proxy, straight from the browser,
        * for this we need to know the current hostname and port.
        */
+
+      const useTLS = window.location.protocol === 'https:';
+      let port = useTLS ? 443 : 80;
+      if (window.location.port) {
+          port = parseInt(window.location.port, 10);
+      }
+
       OpenFeature.setProvider(
         new FlagdWebProvider({
           host: window.location.hostname,
           pathPrefix: 'flagservice',
-          port: window.location.port ? parseInt(window.location.port, 10) : 80,
-          tls: window.location.protocol === 'https:',
+          port: port,
+          tls: useTLS,
           maxRetries: 3,
           maxDelay: 10000,
         })