diff --git a/src/irregular.cpp b/src/irregular.cpp
index 072209af09..77a4405e88 100644
--- a/src/irregular.cpp
+++ b/src/irregular.cpp
@@ -117,7 +117,7 @@ void Irregular::migrate_atoms(int sortflag, int preassign, int *procassign)
   // exchange() doesn't need to clear ghosts b/c borders()
   //   is called right after and it clears ghosts and calls map_set()
 
-  if (map_style) atom->map_clear();
+  if (map_style != Atom::MAP_NONE) atom->map_clear();
   atom->nghost = 0;
   atom->avec->clear_bonus();