diff --git a/config/compilerFlags.cmake b/config/compilerFlags.cmake
index dee3cfa0..c02a4139 100644
--- a/config/compilerFlags.cmake
+++ b/config/compilerFlags.cmake
@@ -58,4 +58,9 @@ if(MSVC)
         set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "/NODEFAULTLIB:MSVCRT")
     endif()
 
+    # Resolving Redefinition Errors Betwen ws2def.h and winsock.h:
+    #  - http://www.zachburlingame.com/2011/05/resolving-redefinition-errors-betwen-ws2def-h-and-winsock-h/
+    #  - https://stackoverflow.com/questions/11040133/what-does-defining-win32-lean-and-mean-exclude-exactly
+    add_definitions(-DWIN32_LEAN_AND_MEAN)
+
 endif()