--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -25,11 +25,11 @@
 set(APP_EXEC                       ${CMAKE_PROJECT_NAME})
 set(DAEMON_EXEC                    ${CMAKE_PROJECT_NAME}-daemon)
 set(DAEMON_PATH                    ${CMAKE_INSTALL_FULL_LIBEXECDIR}/${DAEMON_EXEC})
-if(${CMAKE_SYSTEM_PROCESSOR} MATCHES "i.86")
+if(CMAKE_SIZEOF_VOID_P EQUAL 4)
	set(BITNESS "32")
-else(${CMAKE_SYSTEM_PROCESSOR} MATCHES "i.86")
+else(CMAKE_SIZEOF_VOID_P EQUAL 4)
	set(BITNESS "64")
-endif(${CMAKE_SYSTEM_PROCESSOR} MATCHES "i.86")
+endif(CMAKE_SIZEOF_VOID_P EQUAL 4)
 set(CMAKE_C_FLAGS             "${CMAKE_C_FLAGS} -Wno-deprecated-declarations -Wno-unused-result")
 set(CMAKE_C_FLAGS_DEBUG       "${CMAKE_C_FLAGS_DEBUG} -Wall -Wextra -Wuninitialized -Wstrict-prototypes -Wformat -Wformat-security")
 set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-z,noexecstack -Wl,-z,relro -Wl,-z,now")