diff --git a/src/Episode3/Server.hh b/src/Episode3/Server.hh
index 5b935f41..18fd40f4 100644
--- a/src/Episode3/Server.hh
+++ b/src/Episode3/Server.hh
@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 
+#include <array>
 #include <memory>
 
 #include "../Channel.hh"
diff --git a/src/RareItemSet.hh b/src/RareItemSet.hh
index ece18fba..cbd87804 100644
--- a/src/RareItemSet.hh
+++ b/src/RareItemSet.hh
@@ -2,6 +2,7 @@
 
 #include <stdint.h>
 
+#include <array>
 #include <memory>
 #include <phosg/JSON.hh>
 #include <random>