diff --git a/2024/07.cpp b/2024/07.cpp
index 474d819..b80dcc3 100644
--- a/2024/07.cpp
+++ b/2024/07.cpp
@@ -53,11 +53,11 @@ auto calibrated(
     if (i == 0) {
       if (x == t) { return true; }
     } else {
-      ([&](auto const op) {
+      for (auto const op : {ops...}) {
         if (auto const u = op(t, x)) {
           work.emplace(i - 1, *u);
         }
-      }(ops), ...);
+      }
     }
   }