diff --git a/server/src/main/java/com/defold/extender/ExtensionManifestValidator.java b/server/src/main/java/com/defold/extender/ExtensionManifestValidator.java
index 3fd46975..fef9e486 100644
--- a/server/src/main/java/com/defold/extender/ExtensionManifestValidator.java
+++ b/server/src/main/java/com/defold/extender/ExtensionManifestValidator.java
@@ -115,6 +115,7 @@ void validate(String extensionName, File extensionFolder, Map<String, Object> co
                 case "minSafariVersion":
                 case "minChromeVersion":
                 case "emscriptenLinkFlags":
+                case "externalJsPorts":
                 case "use-clang": // deprecated
                     continue; // no need to whitelist