diff --git a/src/main/java/org/htmlunit/javascript/HtmlUnitContextFactory.java b/src/main/java/org/htmlunit/javascript/HtmlUnitContextFactory.java
index ece7c43bfff..cedadd09ae5 100644
--- a/src/main/java/org/htmlunit/javascript/HtmlUnitContextFactory.java
+++ b/src/main/java/org/htmlunit/javascript/HtmlUnitContextFactory.java
@@ -377,8 +377,6 @@ protected boolean hasFeature(final Context cx, final int featureIndex) {
                 return browserVersion_.hasFeature(JS_ARGUMENTS_READ_ONLY_ACCESSED_FROM_FUNCTION);
             case Context.FEATURE_HTMLUNIT_FUNCTION_DECLARED_FORWARD_IN_BLOCK:
                 return true;
-            case Context.FEATURE_HTMLUNIT_ENUM_NUMBERS_FIRST:
-                return true;
             case Context.FEATURE_HTMLUNIT_MEMBERBOX_NAME:
                 return browserVersion_.hasFeature(JS_PROPERTY_DESCRIPTOR_NAME);
             case Context.FEATURE_HTMLUNIT_MEMBERBOX_NEWLINE: