diff --git a/include/lldb/Host/SocketAddress.h b/include/lldb/Host/SocketAddress.h
index 4dc6210..487f599 100644
--- a/include/lldb/Host/SocketAddress.h
+++ b/include/lldb/Host/SocketAddress.h
@@ -16,7 +16,7 @@
 #ifdef _WIN32
 #include "lldb/Host/windows/windows.h"
 #include <winsock2.h>
-#include <WS2tcpip.h>
+#include <ws2tcpip.h>
 typedef ADDRESS_FAMILY sa_family_t;
 #else
 #include <sys/socket.h>
diff --git a/include/lldb/Host/windows/windows.h b/include/lldb/Host/windows/windows.h
index 760b13b..238d1b3 100644
--- a/include/lldb/Host/windows/windows.h
+++ b/include/lldb/Host/windows/windows.h
@@ -15,7 +15,7 @@
 #define WIN32_LEAN_AND_MEAN
 #define NOGDI
 #define NOMINMAX
-#include <Windows.h>
+#include <windows.h>
 #undef GetUserName
 #undef LoadImage
 #undef CreateProcess
diff --git a/source/Core/ConnectionFileDescriptor.cpp b/source/Core/ConnectionFileDescriptor.cpp
index 743bd26..02133a9 100644
--- a/source/Core/ConnectionFileDescriptor.cpp
+++ b/source/Core/ConnectionFileDescriptor.cpp
@@ -37,7 +37,7 @@
 #ifdef _WIN32
 #include "lldb/Host/windows/windows.h"
 #include <winsock2.h>
-#include <WS2tcpip.h>
+#include <ws2tcpip.h>
 #endif
 
 // C++ Includes
diff --git a/source/Host/common/Host.cpp b/source/Host/common/Host.cpp
index d43221c..eb45f4a 100644
--- a/source/Host/common/Host.cpp
+++ b/source/Host/common/Host.cpp
@@ -16,7 +16,7 @@
 #ifdef _WIN32
 #include "lldb/Host/windows/windows.h"
 #include <winsock2.h>
-#include <WS2tcpip.h>
+#include <ws2tcpip.h>
 #else
 #include <unistd.h>
 #include <dlfcn.h>
diff --git a/tools/driver/Platform.h b/tools/driver/Platform.h
index 6c2f1a2..461fde6 100644
--- a/tools/driver/Platform.h
+++ b/tools/driver/Platform.h
@@ -20,7 +20,7 @@
     #include <io.h>
     #include <eh.h>
     #include <inttypes.h>
-    #include "lldb/Host/windows/Windows.h"
+    #include "lldb/Host/windows/windows.h"
 
     struct timeval
     {