diff --git a/src/server.h b/src/server.h
index 1e6632576..94d8a0d11 100644
--- a/src/server.h
+++ b/src/server.h
@@ -55,6 +55,7 @@
 #include <algorithm>
 #include <memory>
 #include <map>
+#include <string>
 #ifdef __cplusplus
 extern "C" {
 #include <lua.h>