diff --git a/include/rocksdb/filter_policy.h b/include/rocksdb/filter_policy.h
index 8c813d93e..8add48e49 100644
--- a/include/rocksdb/filter_policy.h
+++ b/include/rocksdb/filter_policy.h
@@ -22,6 +22,7 @@
 
 #include <memory>
 #include <stdexcept>
+#include <stdlib.h>
 #include <string>
 #include <vector>