diff --git a/cmake_support/OST.cmake b/cmake_support/OST.cmake
index 00b3d6a30d2671141040089ca88f76e06450fe75..839f9f96576ac97faa0b67e3347ecf377543d3af 100644
--- a/cmake_support/OST.cmake
+++ b/cmake_support/OST.cmake
@@ -866,7 +866,7 @@ macro(setup_compiler_flags)
     #GR:Uses the __fastcall calling convention (x86 only).
     #-EHsc to specify the synchronous exception handling mode/
     #-vmg Uses full generality for pointers to members.
-    add_definitions(-DBOOST_ZLIB_BINARY=zdll)
+    #add_definitions(-DBOOST_ZLIB_BINARY=zdll)
     #add_definitions(-NODEFAULTLIB:LIBCMTD.lib)
   endif()