diff --git a/compiler/optimizing/code_generator_x86.h b/compiler/optimizing/code_generator_x86.h
index 28766d8..6988803 100644
--- a/compiler/optimizing/code_generator_x86.h
+++ b/compiler/optimizing/code_generator_x86.h
@@ -52,7 +52,8 @@
       : CallingConvention(kRuntimeParameterCoreRegisters,
                           kRuntimeParameterCoreRegistersLength,
                           kRuntimeParameterFpuRegisters,
-                          kRuntimeParameterFpuRegistersLength) {}
+                          kRuntimeParameterFpuRegistersLength,
+                          kX86PointerSize) {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InvokeRuntimeCallingConvention);
@@ -64,7 +65,8 @@
       kParameterCoreRegisters,
       kParameterCoreRegistersLength,
       kParameterFpuRegisters,
-      kParameterFpuRegistersLength) {}
+      kParameterFpuRegistersLength,
+      kX86PointerSize) {}
 
   RegisterPair GetRegisterPairAt(size_t argument_index) {
     DCHECK_LT(argument_index + 1, GetNumberOfRegisters());