Error: a function type is not allowed here

[mateusReversing]

I am getting the error when defining a variable in a typedef struct.

typedef struct _RPDO_DEVICE_DATA
 {
       ULONG InstanceNo;
       WDFQUEUE ParentQueue;
  } RPDO_DEVICE_DATA, *PRPDO_DEVICE_DATA;

The error highlights ParentQueue as the error which is why the following removes the error but I need the WDFQUEUE variables name for later:

typedef struct _RPDO_DEVICE_DATA
 {
        ULONG InstanceNo;
        WDFQUEUE;
  } RPDO_DEVICE_DATA, *PRPDO_DEVICE_DATA;