diff --git a/cell.cpp b/cell.cpp
index 74a0c9a8..cb92ff1c 100644
--- a/cell.cpp
+++ b/cell.cpp
@@ -498,7 +498,7 @@ bool cwstepcreates(cellwalker& cw) {
   }
 
 cell *cwpeek(cellwalker cw, int dir) {
-  return createMov(cw.c, (cw.spin+MODFIXER+dir) % cw.c->type);
+  return createMov(cw.c, (cw.spin+MODFIXER+(MIRR(cw)?-dir:dir)) % cw.c->type);
   }
 
 void cwmirrorat(cellwalker& cw, int d) {