"multiple definition" error?

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C++

Linux

when i compile my source code ""g++ main.cpp Test.cpp", i have met error:
"/tmp/ccSer90m.o: (.bss+0x0): multiple definition of `Test::count'
/tmp/cc7iaBlq.o: (.bss+0x0): first defined here
collect2: ld returned 1 exit status"

File "Test.h":

class Test
{
public:
        Test();
private:
        static int count;
};
int Test::count = 0;

File "Test.cpp":

#include <stdio.h>
#include <stdlib.h>
#include "Test.h"
using namespace std;
Test::Test()
{
        count++;
        cout<<count<<endl;
}

File "main.cpp"

#include <stdio.h>
#include <stdlib.h>
#include "Test.h"
using namespace std;

int main ( int argc, char *argv[] )
{
        Test* t = new Test();
        return EXIT_SUCCESS;
}  

Please solve this error help me, thanks!