diff --git a/CMakeLists.txt b/CMakeLists.txt
index ba0c4e0..b2152a0 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -24,13 +24,6 @@ option( BUILD_SHARED_LIB "Set ON to build Shared (DLL) Library"   OFF )
 option( BUILD_TAB2SPACE  "Set ON to build utility app, tab2space" OFF )
 option( BUILD_SAMPLE_CODE "Set ON to build the sample code"       OFF )
 
-if (CMAKE_SIZEOF_VOID_P EQUAL 8)
-    message(STATUS "*** Have SIZEOF void * = 8, so 64-bit")
-    set( IS_64_BIT 1 )
-else ()
-    message(STATUS "*** SIZEOF void * != 8, so not 64-bit")
-endif ()
-
 if(CMAKE_COMPILER_IS_GNUCXX)
     set( WARNING_FLAGS -Wall )
 endif(CMAKE_COMPILER_IS_GNUCXX)
@@ -50,9 +43,6 @@ if(WIN32 AND MSVC)
         set(WARNING_FLAGS "${WARNING_FLAGS} /wd${warning}")
     endforeach()
     set( MSVC_FLAGS "-DNOMINMAX -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_SCL_SECURE_NO_WARNINGS -D__CRT_NONSTDC_NO_WARNINGS" )
-    if (IS_64_BIT)
-        set( MSVC_FLAGS "${MSVC_FLAGS} -DWIN64" )
-    endif ()
     # if (${MSVC_VERSION} EQUAL 1600)
     #    set( MSVC_LD_FLAGS "/FORCE:MULTIPLE" )
     # endif (${MSVC_VERSION} EQUAL 1600)