diff --git a/lib/Target/X86/X86FrameInfo.cpp b/lib/Target/X86/X86FrameInfo.cpp
index afadb4c9b3d..5a8d9768f84 100644
--- a/lib/Target/X86/X86FrameInfo.cpp
+++ b/lib/Target/X86/X86FrameInfo.cpp
@@ -566,6 +566,8 @@ void X86FrameInfo::emitPrologue(MachineFunction &MF) const {
 
     const char *StackProbeSymbol =
       STI.isTargetWindows() ? "_chkstk" : "_alloca";
+    if (Is64Bit && STI.isTargetCygMing())
+      StackProbeSymbol = "__chkstk";
     unsigned CallOp = Is64Bit ? X86::CALL64pcrel32 : X86::CALLpcrel32;
     if (!isEAXAlive) {
       BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)