diff --git a/CMakeLists.txt b/CMakeLists.txt
index 781e602..e35dffe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -23,6 +23,7 @@ else()
     option(USE_CUDA "BUILD WITH CUDA." ON)
     option(USE_FFMPEG "BUILD WITH FFMPEG." ON)
   elseif(PLATFORM STREQUAL "X86_INTEL")
+    add_definitions(-DPLATFORM_X86_INTEL)
     option(USE_FFMPEG "BUILD WITH FFMPEG." ON)
   else()
     message(FATAL_ERROR "UNSUPPORTED PLATFORM!")