diff --git a/src/linux_tcp/sslerrorprinter.h b/src/linux_tcp/sslerrorprinter.h
index 03ddb80..fdfd983 100644
--- a/src/linux_tcp/sslerrorprinter.h
+++ b/src/linux_tcp/sslerrorprinter.h
@@ -18,6 +18,7 @@
  *  Dependencies
  */
 #include "openssl.h"
+#include <string>
 #include <memory>
 
 /**