diff --git a/src/f_op/f_op_actor_mng.cpp b/src/f_op/f_op_actor_mng.cpp
index fa4da69e68..0f5c47df37 100644
--- a/src/f_op/f_op_actor_mng.cpp
+++ b/src/f_op/f_op_actor_mng.cpp
@@ -1020,10 +1020,15 @@ cull_sphere l_cullSizeSphere[fopAc_CULLSPHERE_MAX_e] = {
 
 s32 fopAcM_cullingCheck(fopAc_ac_c const* i_actor) {
     MtxP mtx_p;
+#if AVOID_UB
+    Mtx concat_mtx;
+#endif
     if (fopAcM_GetMtx(i_actor) == NULL) {
         mtx_p = j3dSys.getViewMtx();
     } else {
+#if !AVOID_UB
         Mtx concat_mtx;
+#endif
         cMtx_concat(j3dSys.getViewMtx(), fopAcM_GetMtx(i_actor), concat_mtx);
         mtx_p = concat_mtx;
     }