diff --git a/light/test_light.cc b/light/test_light.cc
index 71343bba..0cc23313 100644
--- a/light/test_light.cc
+++ b/light/test_light.cc
@@ -3,6 +3,7 @@
 #include <light/light.hh>
 
 #include <random>
+#include <algorithm> // for std::sort
 
 #include <glm/vec3.hpp>
 #include <glm/vec4.hpp>