diff --git a/core/cmake/modules/DNGSdkRules.cmake b/core/cmake/modules/DNGSdkRules.cmake
index 489890d265..49badf4469 100644
--- a/core/cmake/modules/DNGSdkRules.cmake
+++ b/core/cmake/modules/DNGSdkRules.cmake
@@ -1,58 +1,56 @@
 #
 # Copyright (c) 2010-2020 by Gilles Caulier, <caulier dot gilles at gmail dot com>
 #
 # Redistribution and use is allowed according to the terms of the BSD license.
 # For details see the accompanying COPYING-CMAKE-SCRIPTS file.
 
 #---------------------------------
 
 # Common DNG SDK definitions for DNGWriter.
 #
 # Set platforms flags.
 # NOTE: see bug #195735: do not enable Mac flags provided by Adobe.
 #       Sounds like all compile fine like under Linux.
 
 add_definitions(-DEnablePluginManager=0)
 add_definitions(-DXMP_StaticBuild=1)
 
 if(MSVC)
     add_definitions(
                     # XMP SDK
                     -DWIN_ENV=1
-                    -DUNIX_ENV=0
 
                     # DNG SDK
                     -DqWinOS=1
                     -DqMacOS=0
                     -DqDNGUseStdInt=0
                     )
 else()
     add_definitions(
                      # XMP SDK
-                    -DWIN_ENV=0
                     -DUNIX_ENV=1
 
                     # DNG SDK
                     -DqWinOS=0
                     -DqMacOS=0
                     -DqDNGUseStdInt=1
                    )
 endif()
 
 # Check processor endianness
 include(TestBigEndian)
 TEST_BIG_ENDIAN(IS_BIG_ENDIAN)
 
 if(NOT IS_BIG_ENDIAN)
     add_definitions(-DqDNGLittleEndian)
 endif()
 
 # Thread safe support under Mac and Linux using pthread library
 
 if(NOT MSVC)
     add_definitions(-DqDNGThreadSafe)
 endif()
 
 # Mode definition for console output.
 
 add_definitions(-DqDNGValidateTarget)