diff --git a/sys/conf/files.amd64 b/sys/conf/files.amd64
index d73fc6af5320..0f71560bdaf9 100644
--- a/sys/conf/files.amd64
+++ b/sys/conf/files.amd64
@@ -79,7 +79,7 @@ acpi_wakecode.o			optional	acpi			\
 	clean		"acpi_wakecode.o"
 acpi_wakecode.bin		optional	acpi			\
 	dependency	"acpi_wakecode.o"				\
-	compile-with	"objcopy -S -O binary acpi_wakecode.o ${.TARGET}" \
+	compile-with	"${OBJCOPY} -S -O binary acpi_wakecode.o ${.TARGET}" \
 	no-obj no-implicit-rule	before-depend				\
 	clean		"acpi_wakecode.bin"
 acpi_wakecode.h			optional	acpi			\
diff --git a/sys/conf/files.i386 b/sys/conf/files.i386
index bb172626f412..f8a4b5dcfd81 100644
--- a/sys/conf/files.i386
+++ b/sys/conf/files.i386
@@ -369,7 +369,7 @@ acpi_wakecode.o			optional acpi				\
 	clean		"acpi_wakecode.o"
 acpi_wakecode.bin		optional acpi				\
 	dependency	"acpi_wakecode.o"				\
-	compile-with	"objcopy -S -O binary acpi_wakecode.o ${.TARGET}" \
+	compile-with	"${OBJCOPY} -S -O binary acpi_wakecode.o ${.TARGET}" \
 	no-obj no-implicit-rule	before-depend				\
 	clean		"acpi_wakecode.bin"
 acpi_wakecode.h			optional acpi				\