diff --git a/src/mutex.cpp b/src/mutex.cpp
index b3e9677..6f6da64 100644
--- a/src/mutex.cpp
+++ b/src/mutex.cpp
@@ -23,6 +23,9 @@
 #elif  BX_PLATFORM_WINDOWS \
 	|| BX_PLATFORM_WINRT   \
 	|| BX_PLATFORM_XBOXONE
+#	ifndef WIN32_LEAN_AND_MEAN
+#		define WIN32_LEAN_AND_MEAN
+#	endif // WIN32_LEAN_AND_MEAN
 #	include <windows.h>
 #	include <errno.h>
 #endif // BX_PLATFORM_
diff --git a/src/os.cpp b/src/os.cpp
index 12586aa..65ce48a 100644
--- a/src/os.cpp
+++ b/src/os.cpp
@@ -15,6 +15,9 @@
 #endif // BX_CRT_MSVC
 
 #if BX_PLATFORM_WINDOWS || BX_PLATFORM_WINRT
+#	ifndef WIN32_LEAN_AND_MEAN
+#		define WIN32_LEAN_AND_MEAN
+#	endif // WIN32_LEAN_AND_MEAN
 #	include <windows.h>
 #	include <psapi.h>
 #elif  BX_PLATFORM_ANDROID    \
diff --git a/src/semaphore.cpp b/src/semaphore.cpp
index 3e3083d..4b62d08 100644
--- a/src/semaphore.cpp
+++ b/src/semaphore.cpp
@@ -20,6 +20,9 @@
 #elif  BX_PLATFORM_WINDOWS \
 	|| BX_PLATFORM_WINRT   \
 	|| BX_PLATFORM_XBOXONE
+#	ifndef WIN32_LEAN_AND_MEAN
+#		define WIN32_LEAN_AND_MEAN
+#	endif // WIN32_LEAN_AND_MEAN
 #	include <windows.h>
 #	include <limits.h>
 #	if BX_PLATFORM_XBOXONE
diff --git a/src/thread.cpp b/src/thread.cpp
index 17ace09..c53aa87 100644
--- a/src/thread.cpp
+++ b/src/thread.cpp
@@ -34,6 +34,9 @@
 	|| BX_PLATFORM_WINRT   \
 	|| BX_PLATFORM_XBOXONE \
 	|| BX_PLATFORM_WINRT
+#	ifndef WIN32_LEAN_AND_MEAN
+#		define WIN32_LEAN_AND_MEAN
+#	endif // WIN32_LEAN_AND_MEAN
 #	include <windows.h>
 #	include <limits.h>
 #	include <errno.h>
diff --git a/src/timer.cpp b/src/timer.cpp
index 45806b1..b6ef62e 100644
--- a/src/timer.cpp
+++ b/src/timer.cpp
@@ -13,6 +13,9 @@
 #elif BX_PLATFORM_EMSCRIPTEN
 #	include <emscripten.h>
 #elif BX_PLATFORM_WINDOWS || BX_PLATFORM_XBOXONE || BX_PLATFORM_WINRT
+#	ifndef WIN32_LEAN_AND_MEAN
+#		define WIN32_LEAN_AND_MEAN
+#	endif // WIN32_LEAN_AND_MEAN
 #	include <windows.h>
 #else
 #	include <sys/time.h> // gettimeofday