diff --git a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer
index 06501fb02..8dea4330e 100755
Binary files a/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer and b/slsDetectorServers/ctbDetectorServer/bin/ctbDetectorServer_developer differ
diff --git a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
index b6b7e482c..afada678c 100755
--- a/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/ctbDetectorServer/slsDetectorFunctionList.c
@@ -1423,13 +1423,13 @@ int setHighVoltage(int val){
 		uint32_t addr = POWER_REG;
 
 		// switch to external high voltage
-		bus_w(addr, bus_r(addr) & (~POWER_HV_INTERNAL_SLCT_OFST));
+		bus_w(addr, bus_r(addr) & (~POWER_HV_INTERNAL_SLCT_MSK));
 
 		MAX1932_Set(val);
 
 		// switch on internal high voltage, if set
 		if (val > 0)
-		    bus_w(addr, bus_r(addr) | POWER_HV_INTERNAL_SLCT_OFST);
+		    bus_w(addr, bus_r(addr) | POWER_HV_INTERNAL_SLCT_MSK);
 
 		highvoltage = val;
 	}