diff --git a/src/HTTPSConnection.cpp b/src/HTTPSConnection.cpp
index 4ec663d..01833d4 100644
--- a/src/HTTPSConnection.cpp
+++ b/src/HTTPSConnection.cpp
@@ -1,4 +1,5 @@
 #include "HTTPSConnection.hpp"
+#include "mbedtls/error.h"
 #include "mbedtls/net_sockets.h"
 
 namespace httpsserver {