diff --git a/Builds/Linux/build/40-open-ephys.rules b/Builds/Linux/build/40-open-ephys.rules
index 9dd2a6f2b4fc97f9870971d992d96ce13c20c1af..683534f9b5ec27ba6eb7c86ff0d4595463772b32 100644
--- a/Builds/Linux/build/40-open-ephys.rules
+++ b/Builds/Linux/build/40-open-ephys.rules
@@ -6,7 +6,7 @@
 # For FedoraCore 5 and similar:
 
 # Change permissions for Opal Kelly FPGAs
-SUBSYSTEM=="usb_device", SYSFS{idVendor}=="151f", MODE="0666"
+SUBSYSTEM=="usb_device", SYSFS{idVendor}=="151f", MODE:="0666"
 
 # Change permissions for the Intan Development Board:
 SUBSYSTEM=="usb_device", SYSFS{idVendor}=="0403", SYSFS{idProduct}=="6010", MODE:="0666"