diff --git a/src/x87/interface-descriptors-x87.cc b/src/x87/interface-descriptors-x87.cc
index 506ed47fac..8a6b55e2d3 100644
--- a/src/x87/interface-descriptors-x87.cc
+++ b/src/x87/interface-descriptors-x87.cc
@@ -56,6 +56,11 @@ const Register MathPowIntegerDescriptor::exponent() {
 }
 
 
+const Register GrowArrayElementsDescriptor::ObjectRegister() { return eax; }
+const Register GrowArrayElementsDescriptor::KeyRegister() { return ebx; }
+const Register GrowArrayElementsDescriptor::CapacityRegister() { return ecx; }
+
+
 void FastNewClosureDescriptor::Initialize(CallInterfaceDescriptorData* data) {
   Register registers[] = {esi, ebx};
   data->Initialize(arraysize(registers), registers, NULL);