diff --git a/stand/libsa/Makefile b/stand/libsa/Makefile
--- a/stand/libsa/Makefile
+++ b/stand/libsa/Makefile
@@ -66,6 +66,9 @@
 SRCS+=	divmoddi4.c  divmodsi4.c  divdi3.c  divsi3.c  moddi3.c  modsi3.c
 SRCS+=	udivmoddi4.c udivmodsi4.c udivdi3.c udivsi3.c umoddi3.c umodsi3.c
 SRCS+=	ashldi3.c ashrdi3.c lshrdi3.c
+.if ${MACHINE_CPUARCH} == "riscv"
+SRCS+=	bswapdi2.c bswapsi2.c clzdi2.c ctzdi2.c
+.endif
 
 .if ${MACHINE_CPUARCH:Namd64:Ni386} == ""
 .PATH: ${SASRC}/x86