Make file with -std=c++11 newbe quesstion

I am writing a makefile for my program (that is tested and works) With files A.h/.cpp B.h/.cpp C.h/.cpp and my main.cpp. The problem I can tell is that some how my '-std=c++11' is not running in the function. The code pops out a unrecognized error that I dont get when I simply run 'g++ -o exe -std=c++11 *.cpp'. Here is my make file.

   HEADERS = A.h B.h C.h
   OBJECTS = A.o B.o C.o main.o
   exe: $(OBJECTS)
      g++ -std=c++11 $^ -o $@
   %.o: %.cpp $(HEADERS)
      g++ -c -std=c++11 $< -o $@
   clean:
      rm -i *.o exe

I am brand new to makefiles so I could be something very dumb.

Thank you.