diff --git a/lib/log.hpp b/lib/log.hpp
index 09426d6..88b98b6 100644
--- a/lib/log.hpp
+++ b/lib/log.hpp
@@ -4,6 +4,7 @@
 #include <iostream>
 #include <iomanip>
 #include <string>
+#include <sstream>
 #include <fstream>
 #include <time.h>
 #include <sys/stat.h>