diff --git a/src/lib_ffi.c b/src/lib_ffi.c
index 136e98e8..199cfc9a 100644
--- a/src/lib_ffi.c
+++ b/src/lib_ffi.c
@@ -194,7 +194,7 @@ LJLIB_CF(ffi_meta___eq)		LJLIB_REC(cdata_arith MM_eq)
 
 LJLIB_CF(ffi_meta___len)	LJLIB_REC(cdata_arith MM_len)
 {
-  return ffi_arith(L);
+  return lj_carith_len(L);
 }
 
 LJLIB_CF(ffi_meta___lt)		LJLIB_REC(cdata_arith MM_lt)
diff --git a/src/lj_carith.c b/src/lj_carith.c
index 218abd26..1c050eba 100644
--- a/src/lj_carith.c
+++ b/src/lj_carith.c
@@ -274,6 +274,15 @@ int lj_carith_op(lua_State *L, MMS mm)
   return lj_carith_meta(L, cts, &ca, mm);
 }
 
+/* No built-in functionality for length of cdata. */
+int lj_carith_len(lua_State *L)
+{
+  CTState *cts = ctype_cts(L);
+  CDArith ca;
+  carith_checkarg(L, cts, &ca);
+  return lj_carith_meta(L, cts, &ca, MM_len);
+}
+
 /* -- 64 bit bit operations helpers --------------------------------------- */
 
 #if LJ_64
@@ -347,7 +356,6 @@ uint64_t lj_carith_check64(lua_State *L, int narg, CTypeID *id)
   }
 }
 
-
 /* -- 64 bit integer arithmetic helpers ----------------------------------- */
 
 #if LJ_32 && LJ_HASJIT
diff --git a/src/lj_carith.h b/src/lj_carith.h
index 67d976bf..3b0a5dd7 100644
--- a/src/lj_carith.h
+++ b/src/lj_carith.h
@@ -11,6 +11,7 @@
 #if LJ_HASFFI
 
 LJ_FUNC int lj_carith_op(lua_State *L, MMS mm);
+LJ_FUNC int lj_carith_len(lua_State *L);
 
 #if LJ_32
 LJ_FUNC uint64_t lj_carith_shl64(uint64_t x, int32_t sh);