diff --git a/src/change_box.cpp b/src/change_box.cpp
index 1bd3fe733f..a214a56969 100644
--- a/src/change_box.cpp
+++ b/src/change_box.cpp
@@ -176,7 +176,7 @@ void ChangeBox::command(int narg, char **arg)
 
   int move_atoms = 0;
   for (int m = 0; m < nops; m++) {
-    if (ops[m].style != ORTHO || ops[m].style != TRICLINIC) move_atoms = 1;
+    if (ops[m].style != ORTHO && ops[m].style != TRICLINIC) move_atoms = 1;
   }
 
   // error if moving atoms and there is stored per-atom restart state