diff --git a/reg3.cpp b/reg3.cpp
index d59e02b1..4026512b 100644
--- a/reg3.cpp
+++ b/reg3.cpp
@@ -1117,6 +1117,7 @@ EX namespace reg3 {
         target->zebraval = 0;
         return;
         }
+      generate_cellrotations();
       auto& cr = cgi.cellrotations;
       if(evmemo.empty()) {
         println(hlog, "starting");