diff --git a/sys/conf/files.amd64 b/sys/conf/files.amd64
index 181c597afc05..9300f898eb3e 100644
--- a/sys/conf/files.amd64
+++ b/sys/conf/files.amd64
@@ -298,7 +298,7 @@ x86/cpufreq/est.c		optional	cpufreq
 x86/cpufreq/hwpstate.c		optional	cpufreq
 x86/cpufreq/p4tcc.c		optional	cpufreq
 x86/isa/atpic.c			optional	atpic isa
-x86/isa/atrtc.c			optional	atpic
+x86/isa/atrtc.c			standard
 x86/isa/clock.c			standard
 x86/isa/elcr.c			standard
 x86/isa/isa.c			standard