diff --git a/llvm/lib/Target/X86/X86FrameLowering.cpp b/llvm/lib/Target/X86/X86FrameLowering.cpp
index cead0995330b..1d2c73c4308c 100644
--- a/llvm/lib/Target/X86/X86FrameLowering.cpp
+++ b/llvm/lib/Target/X86/X86FrameLowering.cpp
@@ -581,7 +581,7 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
   bool Is64Bit = STI.is64Bit();
   // standard x86_64 and NaCl use 64-bit frame/stack pointers, x32 - 32-bit.
   const bool Uses64BitFramePtr = STI.isTarget64BitLP64() || STI.isTargetNaCl64();
-  bool IsWin64 = STI.isTargetWin64();
+  bool IsWin64 = STI.isCallingConvWin64(Fn->getCallingConv());
   // Not necessarily synonymous with IsWin64.
   bool IsWinEH = MF.getTarget().getMCAsmInfo()->usesWindowsCFI();
   bool NeedsWinEH = IsWinEH && Fn->needsUnwindTableEntry();
diff --git a/llvm/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll b/llvm/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
index 98b1e0ed2f42..8d387136da9c 100644
--- a/llvm/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
+++ b/llvm/test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
@@ -1,7 +1,8 @@
 ; RUN: llc -mtriple=x86_64-mingw32 < %s | FileCheck %s
+; RUN: llc -mtriple=x86_64-linux < %s | FileCheck %s
 ; CHECK-NOT: -{{[1-9][0-9]*}}(%rsp)
 
-define x86_fp80 @a(i64 %x) nounwind readnone {
+define x86_64_win64cc x86_fp80 @a(i64 %x) nounwind readnone {
 entry:
         %conv = sitofp i64 %x to x86_fp80               ; <x86_fp80> [#uses=1]
         ret x86_fp80 %conv