diff --git a/sys/conf/files.riscv b/sys/conf/files.riscv
index 2a80064e88b..90a74367a54 100644
--- a/sys/conf/files.riscv
+++ b/sys/conf/files.riscv
@@ -34,6 +34,8 @@ kern/subr_dummy_vdso_tc.c	standard
 kern/subr_efi_map.c		standard
 kern/subr_intr.c		standard
 kern/subr_physmem.c		standard
+libkern/ffs.c			standard
+libkern/ffsdi2.c		standard
 libkern/bcopy.c			standard
 libkern/memcmp.c		standard
 libkern/memset.c		standard