Problem importing Fortran routine from a dll

I have a Fortran console application which is trying to import a routine from a Fortran dll.  I'm getting the following error message when linking.

error LNK2019: unresolved external symbol __imp__USELOG referenced in function _MAIN__

The interface for the routine is:
INTERFACE
   SUBROUTINE USELOG(logname, progname, version)
      !DEC$ ATTRIBUTES, ALIAS:'USELOG' :: USELOG
      !DEC$ ATTRIBUTES DLLIMPORT :: USELOG
      CHARACTER(LEN=26) :: logname
      CHARACTER(LEN=26) :: progname
      CHARACTER(LEN= 5) :: version
      !DEC$ ATTRIBUTES REFERENCE :: logname, progname, version
   END SUBROUTINE USELOG
END INTERFACE

The routine USELOG uses the following code for exporting:
   !DEC$ ATTRIBUTES DLLEXPORT :: USELOG
   !DEC$ ATTRIBUTES ALIAS:'USELOG' :: USELOG
   !DEC$ ATTRIBUTES REFERENCE :: logname_, progname_, version_

When I view the dll using dependency walker the routine is shown as USELOG without any decoration.

Could someone please tell me how to import this correctly.

Regards, Mike