diff --git a/cmake/compilerDefinitions.cmake b/cmake/compilerDefinitions.cmake
index 5de849fc399..f650f483d4c 100644
--- a/cmake/compilerDefinitions.cmake
+++ b/cmake/compilerDefinitions.cmake
@@ -7,7 +7,6 @@ if(MSVC)
     add_definitions(-DWIN32)
     add_definitions(-D_CRT_SECURE_NO_WARNINGS)
     add_definitions(-DWIN32_LEAN_MEAN)
-    add_definitions(-D_WIN64)
 endif()
 
 # TODO: this should probably apply to the compiler and not the platform - I think it is only "broken" with MinGW