diff --git a/lsp/connection.cpp b/lsp/connection.cpp
index e7368c3..0515fe1 100644
--- a/lsp/connection.cpp
+++ b/lsp/connection.cpp
@@ -5,6 +5,7 @@
 #include <lsp/connection.h>
 #include <lsp/json/json.h>
 #include <lsp/io/stream.h>
+#include <ios>
 
 #ifndef LSP_MESSAGE_DEBUG_LOG
 	#ifdef NDEBUG