1 files changed, 1 insertions, 0 deletions

diff --git a/stddev.cpp b/stddev.cpp
index 5920b6d..50d81f9 100644
--- a/stddev.cpp
+++ b/stddev.cpp
@@ -1,5 +1,6 @@
 #include <iostream>
 #include <vector>
+#include <algorithm>
 #include <cmath>
 #include <cctype>