diff --git a/rtb/common/split_string.hpp b/rtb/common/split_string.hpp
index 87a12bb..b95e42b 100644
--- a/rtb/common/split_string.hpp
+++ b/rtb/common/split_string.hpp
@@ -22,6 +22,7 @@
 #include <vector>
 #include <string>
 #include <iterator>
+#include <cstring>
 
 namespace vanilla { namespace common {