diff --git a/clamdscan/clamav-clamdscan@.service.in b/clamdscan/clamav-clamdscan@.service.in
index 959129fbbc..01dc2a87ab 100644
--- a/clamdscan/clamav-clamdscan@.service.in
+++ b/clamdscan/clamav-clamdscan@.service.in
@@ -3,4 +3,6 @@ Description=ClamAV clamdscan %f
 Documentation=man:clamdscan(1) man:clamdscan.conf(5) https://docs.clamav.net/
 
 [Service]
+Nice=19
+IOSchedulingClass=idle
 ExecStart=@prefix@/bin/clamdscan --infected --multiscan --fdpass %f