diff --git a/src/codegen/ppc/interface-descriptors-ppc.cc b/src/codegen/ppc/interface-descriptors-ppc.cc
index cab95e2f41..4d68e01285 100644
--- a/src/codegen/ppc/interface-descriptors-ppc.cc
+++ b/src/codegen/ppc/interface-descriptors-ppc.cc
@@ -52,6 +52,11 @@ const Register LoadDescriptor::SlotRegister() { return r3; }
 
 const Register LoadWithVectorDescriptor::VectorRegister() { return r6; }
 
+const Register
+LoadWithReceiverAndVectorDescriptor::LookupStartObjectRegister() {
+  return r7;
+}
+
 const Register StoreDescriptor::ReceiverRegister() { return r4; }
 const Register StoreDescriptor::NameRegister() { return r5; }
 const Register StoreDescriptor::ValueRegister() { return r3; }
diff --git a/src/codegen/s390/interface-descriptors-s390.cc b/src/codegen/s390/interface-descriptors-s390.cc
index 9e341c357b..6c56c19b5a 100644
--- a/src/codegen/s390/interface-descriptors-s390.cc
+++ b/src/codegen/s390/interface-descriptors-s390.cc
@@ -52,6 +52,11 @@ const Register LoadDescriptor::SlotRegister() { return r2; }
 
 const Register LoadWithVectorDescriptor::VectorRegister() { return r5; }
 
+const Register
+LoadWithReceiverAndVectorDescriptor::LookupStartObjectRegister() {
+  return r6;
+}
+
 const Register StoreDescriptor::ReceiverRegister() { return r3; }
 const Register StoreDescriptor::NameRegister() { return r4; }
 const Register StoreDescriptor::ValueRegister() { return r2; }