Shrinking DHCP range and reservations

Hi I have a Fortigate as DHCP server and it is delivering IP addresses in the range of 10.57.20.20-10.57.20.50 and I have an IP address reserved, lets say 10.57.20.25 to a PC. My question is, if I shrink the range to 10.57.20.30-10.57.20.50, does the reservation (10.57.20.25) still valid and funcional? Thanks in advance