diff --git a/src/luaconf.h.template.in b/src/luaconf.h.template.in
index fe9681a..b3ad699 100644
--- a/src/luaconf.h.template.in
+++ b/src/luaconf.h.template.in
@@ -100,7 +100,7 @@
 #define LUA_LDIR	"%lua_datadir%/lua/5.1/"
 #if defined __alpha__ || defined __ia64__ || defined __powerpc64__ || \
     defined __s390x__ || defined __sparc64__ || defined __x86_64__ || \
-    defined __aarch64__
+    defined __aarch64__ || (defined __riscv && __SIZEOF_POINTER__ == 8)
 #define LUA_CDIR	"/usr/lib64/lua/5.1/"
 #else
 #define LUA_CDIR	"/usr/lib/lua/5.1/"