diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8aeefd3044..8c4a0bd0dd 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,13 @@ if(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
 	if (NOT MOBILE_DEVICE)
 		set(USE_FFMPEG ON)
 	endif()
+	if (NOT ARM)
+		if(CMAKE_SIZEOF_VOID_P EQUAL 8)
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_M_X64")
+		else()
+			set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -D_M_IX86")
+		endif()
+	endif()
 endif()
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")