diff --git a/src/town_cmd.cpp b/src/town_cmd.cpp
--- a/src/town_cmd.cpp
+++ b/src/town_cmd.cpp
@@ -112,8 +112,7 @@ Town::~Town()
 	DeleteWindowById(WC_TOWN_VIEW, this->index);
 
 	/* Check no industry is related to us. */
-	const Industry *i;
-	FOR_ALL_INDUSTRIES(i) assert(i->town != this);
+	for (const Industry *i : Industry::Iterate()) assert(i->town != this);
 
 	/* ... and no object is related to us. */
 	const Object *o;