diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 41fddcc59d5..637107c021f 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -1295,6 +1295,8 @@ ARMTargetLowering::getEffectiveCallingConv(CallingConv::ID CC,
       return CallingConv::ARM_AAPCS_VFP;
     else
       return CallingConv::ARM_AAPCS;
+  case CallingConv::Mono:
+	  return CallingConv::Mono;
   }
 }