There must be something stupid obvious about this that I'm just...missing.

I'm getting this error:
"Compile Error: Function call on left-hand side of assignment must return Variant or Object"

Here's a snippet of my code that's giving the error:
    For Each c In Range("F" & StoreAreaFR & ":" & "F" & StoreAreaLR)
        Loc = c.Offset(0, -3).Value
        c.Value = Loc
    Next c
This is stripped down version the code, so I could isolate the error...it's supposed to use the "Loc" variable as a Lookup value once I figure out why it's giving me this error...

Any help is much appreciated!