diff --git a/day1/examples/binforms.cc b/day1/examples/binforms.cc
index baeb5f8e637b9312b0018b7141e3ae63a1aa499c..aa70c2c4a75a5c3813dd4e72df856212cf4b1891 100644
--- a/day1/examples/binforms.cc
+++ b/day1/examples/binforms.cc
@@ -7,7 +7,7 @@ void handle()
     std::cout << "Enter value: ";
     T v;
     std::cin >> v;
-    cxx2023::showbits(v);
+    cxx_course::showbits(v);
 }
 
 auto main() -> int