diff --git a/geojson.cpp b/geojson.cpp
index 1dd0942e..dc25b1e1 100644
--- a/geojson.cpp
+++ b/geojson.cpp
@@ -20,6 +20,7 @@
 #include <sys/resource.h>
 #include <pthread.h>
 #include <vector>
+#include <algorithm>
 #include <set>
 #include <map>
 #include <string>