--- include/CL/cl.hpp
+++ include/CL/cl.hpp
@@ -201,7 +201,7 @@
 #include <functional>
 #define __CL_FUNCTION_TYPE typename std::function
 #define CL_USE_CPP_FUNCTORS
-#elif (__GNUC__ == 4 && __GNUC_MINOR__ >= 1 && !defined(STLPORT)) || defined(__APPLE__) || defined(__MACOSX)
+#elif (((__GNUC__ == 4 && __GNUC_MINOR__ >= 1) || (__GNUC__ >= 5)) && !defined(STLPORT)) || defined(__APPLE__) || defined(__MACOSX)
 #include <tr1/functional>
 #define __CL_FUNCTION_TYPE typename std::tr1::function
 #define CL_USE_CPP_FUNCTORS