diff --git a/backtracking/magic_sequence.cpp b/backtracking/magic_sequence.cpp
index 13a260dc9..478dd28dc 100644
--- a/backtracking/magic_sequence.cpp
+++ b/backtracking/magic_sequence.cpp
@@ -132,4 +132,5 @@ int main() {
             backtracking::magic_sequence::print(item);
         }
     }
+    return 0;
 }