diff --git a/content/xbl/src/nsXBLBinding.cpp b/content/xbl/src/nsXBLBinding.cpp
index 84cc81b6f58..51303beabaa 100644
--- a/content/xbl/src/nsXBLBinding.cpp
+++ b/content/xbl/src/nsXBLBinding.cpp
@@ -761,7 +761,7 @@ nsXBLBinding::InstallProperties(nsIContent* aBoundElement)
         if (!body.IsEmpty()) {
           void* myFunc;
           nsCAutoString cname; cname.AssignWithConversion(name.GetUnicode());
-          rv = context->CompileFunction(scriptObject,
+          rv = context->CompileFunction(classObject,
                                         cname,
                                         argCount,
                                         (const char**)args,
diff --git a/layout/xbl/src/nsXBLBinding.cpp b/layout/xbl/src/nsXBLBinding.cpp
index 84cc81b6f58..51303beabaa 100644
--- a/layout/xbl/src/nsXBLBinding.cpp
+++ b/layout/xbl/src/nsXBLBinding.cpp
@@ -761,7 +761,7 @@ nsXBLBinding::InstallProperties(nsIContent* aBoundElement)
         if (!body.IsEmpty()) {
           void* myFunc;
           nsCAutoString cname; cname.AssignWithConversion(name.GetUnicode());
-          rv = context->CompileFunction(scriptObject,
+          rv = context->CompileFunction(classObject,
                                         cname,
                                         argCount,
                                         (const char**)args,