diff --git a/src/libsync/abstractnetworkjob.cpp b/src/libsync/abstractnetworkjob.cpp
index f5f4b9d625..14f8b1dda8 100644
--- a/src/libsync/abstractnetworkjob.cpp
+++ b/src/libsync/abstractnetworkjob.cpp
@@ -26,6 +26,7 @@
 #include <QTimer>
 #include <QMutex>
 #include <QCoreApplication>
+#include <QAuthenticator>
 
 #include "networkjobs.h"
 #include "account.h"
diff --git a/src/libsync/account.cpp b/src/libsync/account.cpp
index 61a99c0655..589b8e5bd1 100644
--- a/src/libsync/account.cpp
+++ b/src/libsync/account.cpp
@@ -32,6 +32,7 @@
 #include <QFileInfo>
 #include <QDir>
 #include <QSslKey>
+#include <QAuthenticator>
 
 namespace OCC {
 
diff --git a/src/libsync/creds/httpcredentials.cpp b/src/libsync/creds/httpcredentials.cpp
index 54a73fbf22..a408904247 100644
--- a/src/libsync/creds/httpcredentials.cpp
+++ b/src/libsync/creds/httpcredentials.cpp
@@ -31,6 +31,7 @@
 #include "syncengine.h"
 #include "creds/credentialscommon.h"
 #include "creds/httpcredentials.h"
+#include <QAuthenticator>
 
 using namespace QKeychain;