diff --git a/2019/03.cpp b/2019/03.cpp
index 6464087..e899191 100644
--- a/2019/03.cpp
+++ b/2019/03.cpp
@@ -7,6 +7,7 @@
 #include <map>
 #include <tuple>
 #include <string>
+#include <numeric>
 
 #include <aocpp/Coord.hpp>
 #include <aocpp/Startup.hpp>
diff --git a/2019/08.cpp b/2019/08.cpp
index a76f710..a479f3f 100644
--- a/2019/08.cpp
+++ b/2019/08.cpp
@@ -5,6 +5,7 @@
 #include <iterator>
 #include <vector>
 #include <string_view>
+#include <numeric>
 
 #include <aocpp/Startup.hpp>