libcall problem under windows

Hi,

After linking this dll ...

.h
extern "C" __declspec(dllexport) char * decrease(int * a);

.cpp
extern "C" __declspec(dllexport)
char * decrease(int * a)
{
*a = - *a;
return NULL;
}

...I call it from gvim with this command
echo libcall("dlltest.dll", "decrease", "5")

but I get the E364 error

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