diff --git a/lokimq/address.cpp b/lokimq/address.cpp
index 6fa0c17..9d4d0a8 100644
--- a/lokimq/address.cpp
+++ b/lokimq/address.cpp
@@ -4,6 +4,7 @@
 #include <cstddef>
 #include <utility>
 #include <stdexcept>
+#include <ostream>
 #include "hex.h"
 #include "base32z.h"
 #include "base64.h"
diff --git a/lokimq/auth.cpp b/lokimq/auth.cpp
index 90a7814..985ff63 100644
--- a/lokimq/auth.cpp
+++ b/lokimq/auth.cpp
@@ -1,6 +1,8 @@
 #include "lokimq.h"
 #include "hex.h"
 #include "lokimq-internal.h"
+#include <ostream>
+#include <sstream>
 
 namespace lokimq {
 
diff --git a/lokimq/auth.h b/lokimq/auth.h
index 5e4afb9..431998f 100644
--- a/lokimq/auth.h
+++ b/lokimq/auth.h
@@ -1,5 +1,5 @@
 #pragma once
-#include <iostream>
+#include <iosfwd>
 #include <string>
 #include <cstring>
 #include <unordered_set>