1 files changed, 1 insertions, 1 deletions

diff --git a/2016/src/day04.cpp b/2016/src/day04.cpp
index 713b16f..e4c292b 100644
--- a/2016/src/day04.cpp
+++ b/2016/src/day04.cpp
@@ -17,7 +17,7 @@ split(const string& line, const regex& sep)
 }
 
 vector<tuple<vector<string>, long, string>>
-read_file(string_view filename)
+read_file(const string& filename)
 {
         fstream input{ filename };