diff --git a/src/3d/model.c b/src/3d/model.c
index 30bb1c2..fbef578 100644
--- a/src/3d/model.c
+++ b/src/3d/model.c
@@ -594,7 +594,7 @@ void model_free(struct model *model)
 
 	for (int i = 0; i < model->nr_bones; i++)
 		destroy_bone(&model->bones[i]);
-	free(model->bones);
+	xfree_aligned(model->bones);
 	if (model->bone_map)
 		ht_free_int(model->bone_map);
 	if (model->bone_name_map)
diff --git a/src/3d/reign.c b/src/3d/reign.c
index b26e9c9..eaa86b0 100644
--- a/src/3d/reign.c
+++ b/src/3d/reign.c
@@ -94,7 +94,7 @@ static void unload_instance(struct RE_instance *instance)
 static void free_instance(struct RE_instance *instance)
 {
 	unload_instance(instance);
-	free(instance);
+	xfree_aligned(instance);
 }
 
 static void RE_back_cg_init(struct RE_back_cg *bcg)
@@ -263,7 +263,7 @@ void RE_plugin_free(struct RE_plugin *plugin)
 		RE_renderer_free(plugin->renderer);
 	for (int i = 0; i < RE_NR_BACK_CGS; i++)
 		RE_back_cg_destroy(&plugin->back_cg[i]);
-	free(plugin);
+	xfree_aligned(plugin);
 }
 
 bool RE_plugin_bind(struct RE_plugin *plugin, int sprite)
diff --git a/src/dungeon/dungeon.c b/src/dungeon/dungeon.c
index 71d0033..ef8836b 100644
--- a/src/dungeon/dungeon.c
+++ b/src/dungeon/dungeon.c
@@ -102,7 +102,7 @@ static void dungeon_context_free(struct draw_plugin *plugin)
 	if (ctx->map)
 		dungeon_map_free(ctx->map);
 
-	free(ctx);
+	xfree_aligned(ctx);
 }
 
 static GLuint *load_event_textures(int *nr_textures_out)
diff --git a/src/parts/flash.c b/src/parts/flash.c
index 3149fc8..b5752ad 100644
--- a/src/parts/flash.c
+++ b/src/parts/flash.c
@@ -38,7 +38,7 @@ static void clear_display_list(struct parts_flash *f)
 	while (!TAILQ_EMPTY(&f->display_list)) {
 		struct parts_flash_object *obj = TAILQ_FIRST(&f->display_list);
 		TAILQ_REMOVE(&f->display_list, obj, entry);
-		free(obj);
+		xfree_aligned(obj);
 	}
 }
 
@@ -62,7 +62,7 @@ void parts_flash_free(struct parts_flash *f)
 		ht_free_int(f->bitmaps);
 	}
 	if (f->sprites) {
-		ht_foreach_value(f->sprites, free);
+		ht_foreach_value(f->sprites, xfree_aligned);
 		ht_free_int(f->sprites);
 	}
 }
@@ -216,7 +216,7 @@ static void remove_object(struct parts_flash *f, struct swf_tag_remove_object2 *
 	TAILQ_FOREACH(p, &f->display_list, entry) {
 		if (p->depth == tag->depth) {
 			TAILQ_REMOVE(&f->display_list, p, entry);
-			free(p);
+			xfree_aligned(p);
 			return;
 		}
 	}
diff --git a/subprojects/libsys4 b/subprojects/libsys4
index 920dd01..ca1328f 160000
--- a/subprojects/libsys4
+++ b/subprojects/libsys4
@@ -1 +1 @@
-Subproject commit 920dd0185a5042b2034ba0c37278eb7705f1434d
+Subproject commit ca1328fc66209b09abb75de92e111f39fd3a15c0