diff --git a/layout/style/test/ListCSSProperties.cpp b/layout/style/test/ListCSSProperties.cpp
index df06ffac358c1b245c84432aa6f143f9c5806029..0bca4b9b40b3b030c54fc36c659966dd3a8894f7 100644
--- a/layout/style/test/ListCSSProperties.cpp
+++ b/layout/style/test/ListCSSProperties.cpp
@@ -109,6 +109,7 @@ const char* gInaccessibleProperties[] = {
     "-moz-window-opacity",                // chrome-only internal properties
     "-moz-window-transform",              // chrome-only internal properties
     "-moz-window-shadow",                 // chrome-only internal properties
+    "-zen-window-transform-origin",       // chrome-only internal properties
 };
 
 inline int is_inaccessible(const char* aPropName) {
