diff --git a/Userland/Libraries/LibWeb/HTML/AttributeNames.h b/Userland/Libraries/LibWeb/HTML/AttributeNames.h
index 51b6d246794..e931d47b4b3 100644
--- a/Userland/Libraries/LibWeb/HTML/AttributeNames.h
+++ b/Userland/Libraries/LibWeb/HTML/AttributeNames.h
@@ -45,6 +45,7 @@ namespace AttributeNames {
     __ENUMERATE_HTML_ATTRIBUTE(classid)                    \
     __ENUMERATE_HTML_ATTRIBUTE(clear)                      \
     __ENUMERATE_HTML_ATTRIBUTE(code)                       \
+    __ENUMERATE_HTML_ATTRIBUTE(codebase)                   \
     __ENUMERATE_HTML_ATTRIBUTE(codetype)                   \
     __ENUMERATE_HTML_ATTRIBUTE(color)                      \
     __ENUMERATE_HTML_ATTRIBUTE(cols)                       \
diff --git a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.idl b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.idl
index 912b440145c..b3feda47f0d 100644
--- a/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.idl
+++ b/Userland/Libraries/LibWeb/HTML/HTMLObjectElement.idl
@@ -32,7 +32,7 @@ interface HTMLObjectElement : HTMLElement {
     [CEReactions, Reflect] attribute unsigned long hspace;
     [CEReactions, Reflect] attribute DOMString standby;
     [CEReactions, Reflect] attribute unsigned long vspace;
-    [FIXME, CEReactions] attribute DOMString codeBase;
+    [CEReactions, Reflect=codebase] attribute DOMString codeBase;
     [CEReactions, Reflect=codetype] attribute DOMString codeType;
     [CEReactions, Reflect=usemap] attribute DOMString useMap;