diff --git a/src/server/request_context.h b/src/server/request_context.h
index 388ce77..1caa006 100644
--- a/src/server/request_context.h
+++ b/src/server/request_context.h
@@ -23,6 +23,7 @@
 #define REQUEST_CONTEXT_H
 
 #include <string>
+#include <sstream>
 #include <map>
 #include <stdexcept>