diff --git a/doc/api/os.markdown b/doc/api/os.markdown
index 477fcba417..3c4e1b44fd 100644
--- a/doc/api/os.markdown
+++ b/doc/api/os.markdown
@@ -14,10 +14,6 @@ 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 d2f5d0a8ad..1106e056a4 100644
--- a/lib/os.js
+++ b/lib/os.js
@@ -8,5 +8,3 @@ exports.totalmem = binding.getTotalMem;
 exports.cpus = binding.getCPUs;
 exports.type = binding.getOSType;
 exports.release = binding.getOSRelease;
-exports.isWindows = binding.isWindows;
-
diff --git a/src/node_os.cc b/src/node_os.cc
index fd6395e947..758648835e 100644
--- a/src/node_os.cc
+++ b/src/node_os.cc
@@ -145,12 +145,6 @@ 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
 }