diff --git a/crypto/arc4.cpp b/crypto/arc4.cpp
index adaa8bd7..792a0e16 100644
--- a/crypto/arc4.cpp
+++ b/crypto/arc4.cpp
@@ -17,6 +17,7 @@
 #include "arc4.hpp"
 
 #include <algorithm>
+#include <numeric>
 
 using util::crypto::ARC4;
 
diff --git a/extent.cpp b/extent.cpp
index 6f64e4bb..9528bdf8 100644
--- a/extent.cpp
+++ b/extent.cpp
@@ -21,6 +21,7 @@
 #include "./stream.hpp"
 
 #include <cmath>
+#include <numeric>
 
 using util::extent;
 using util::extent_range;
diff --git a/geom/aabb.ipp b/geom/aabb.ipp
index bc95f9e1..1f3ec558 100644
--- a/geom/aabb.ipp
+++ b/geom/aabb.ipp
@@ -22,6 +22,7 @@
 
 #include "sample.hpp"
 
+#include <random>
 
 namespace util { namespace geom {
     template <size_t S, typename T, typename G>