diff --git a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/ForwardedParser.java b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/ForwardedParser.java
index 6fe05d63185aa..0bdee036fbf3b 100644
--- a/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/ForwardedParser.java
+++ b/extensions/vertx-http/runtime/src/main/java/io/quarkus/vertx/http/runtime/ForwardedParser.java
@@ -140,7 +140,7 @@ private void calculate() {
 
                 matcher = FORWARDED_FOR_PATTERN.matcher(forwarded);
                 if (matcher.find()) {
-                    remoteAddress = parseFor(matcher.group(1).trim(), remoteAddress.port());
+                    remoteAddress = parseFor(matcher.group(1).trim(), remoteAddress != null ? remoteAddress.port() : port);
                 }
             } else if (forwardingProxyOptions.allowXForwarded) {
                 String protocolHeader = delegate.getHeader(X_FORWARDED_PROTO);
@@ -177,7 +177,7 @@ private void calculate() {
 
                 String forHeader = delegate.getHeader(X_FORWARDED_FOR);
                 if (forHeader != null) {
-                    remoteAddress = parseFor(getFirstElement(forHeader), remoteAddress.port());
+                    remoteAddress = parseFor(getFirstElement(forHeader), remoteAddress != null ? remoteAddress.port() : port);
                 }
             }
         }