batch - Run other cmd in bat like from it's own path

I need to run bat(fix.bat) in cmd batch file (let's say sample.cmd on c:)
The problem is that despite of using:
start /WAIT cmd.exe /C D:\dev\sys\fix.bat

fix.bat runs like from parent command (c:\sample.cmd) but I need to force it to run from its path ("d:\dev\sys")

How to run bat in other bat so the second one will run like executed from it's own path where it's located?

There in example would help to enter:
"cd d:\dev\sys" and then call for fix.bat but I want to avoid that.