diff --git a/llvm/include/llvm/ADT/Triple.h b/llvm/include/llvm/ADT/Triple.h
index 55c884f65f0b..bc91188b8640 100644
--- a/llvm/include/llvm/ADT/Triple.h
+++ b/llvm/include/llvm/ADT/Triple.h
@@ -428,7 +428,7 @@ public:
 
   /// \brief Tests whether the OS is Windows.
   bool isOSWindows() const {
-    return getOS() == Triple::Win32 || isOSCygMing();
+    return getOS() == Triple::Win32;
   }
 
   /// \brief Tests whether the OS is NaCl (Native Client)