diff --git a/doc/api/os.markdown b/doc/api/os.markdown
index 3c4e1b44fd..477fcba417 100644
--- a/doc/api/os.markdown
+++ b/doc/api/os.markdown
@@ -14,6 +14,10 @@ Returns the operating system name.
 
 Returns the operating system release.
 
+### os.isWindows
+
+True on windows, false otherwise.
+
 ### os.uptime()
 
 Returns the system uptime in seconds.
diff --git a/lib/os.js b/lib/os.js
index 5b1bb22d18..007070dc6b 100644
--- a/lib/os.js
+++ b/lib/os.js
@@ -7,4 +7,5 @@ exports.freemem = binding.getFreeMem;
 exports.totalmem = binding.getTotalMem;
 exports.cpus = binding.getCPUs;
 exports.type = binding.getOSType;
-exports.release = binding.getOSRelease;
\ No newline at end of file
+exports.release = binding.getOSRelease;
+exports.isWindows = binding.isWindows;
\ No newline at end of file
diff --git a/src/node_os.cc b/src/node_os.cc
index 758648835e..fd6395e947 100644
--- a/src/node_os.cc
+++ b/src/node_os.cc
@@ -145,6 +145,12 @@ void OS::Initialize(v8::Handle<v8::Object> target) {
   NODE_SET_METHOD(target, "getCPUs", GetCPUInfo);
   NODE_SET_METHOD(target, "getOSType", GetOSType);
   NODE_SET_METHOD(target, "getOSRelease", GetOSRelease);
+
+#ifdef __POSIX__
+  target->Set(String::New("isWindows"), False());
+#else // __MINGW32__
+  target->Set(String::New("isWindows"), True());
+#endif
 }