diff --git a/dom/base/nsDOMClassInfo.cpp b/dom/base/nsDOMClassInfo.cpp
index 8925b642976..d3412644e55 100644
--- a/dom/base/nsDOMClassInfo.cpp
+++ b/dom/base/nsDOMClassInfo.cpp
@@ -1531,7 +1531,7 @@ static nsDOMClassInfoData sClassInfoData[] = {
   NS_DEFINE_CLASSINFO_DATA(WebGLExtensionLoseContext, WebGLExtensionSH,
                            DOM_DEFAULT_SCRIPTABLE_FLAGS |
                            nsIXPCScriptable::WANT_ADDPROPERTY)
-  NS_DEFINE_CLASSINFO_DATA(WebGLExtensionCompressedTextureS3TC, nsDOMGenericSH,
+  NS_DEFINE_CLASSINFO_DATA(WebGLExtensionCompressedTextureS3TC, WebGLExtensionSH,
                            DOM_DEFAULT_SCRIPTABLE_FLAGS |
                            nsIXPCScriptable::WANT_ADDPROPERTY)