diff --git a/kill.cpp b/kill.cpp
index 1269aa2fb..35730bf84 100644
--- a/kill.cpp
+++ b/kill.cpp
@@ -17,7 +17,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
-
+#include <algorithm>
 
 #include "fallback.h"
 #include "util.h"