diff --git a/openlp/core/lib/projector/pjlink1.py b/openlp/core/lib/projector/pjlink1.py
index 8050a6407..ed7b82209 100644
--- a/openlp/core/lib/projector/pjlink1.py
+++ b/openlp/core/lib/projector/pjlink1.py
@@ -436,7 +436,7 @@ class PJLink1(QTcpSocket):
             return
         return self.process_command(cmd, data)
 
-    @pyqtSlot(int)
+    @pyqtSlot(QAbstractSocket.SocketError)
     def get_error(self, err):
         """
         Process error from SocketError signal.
diff --git a/openlp/core/ui/projector/sourceselectform.py b/openlp/core/ui/projector/sourceselectform.py
index 5ee1ac403..8f811c6dd 100644
--- a/openlp/core/ui/projector/sourceselectform.py
+++ b/openlp/core/ui/projector/sourceselectform.py
@@ -30,8 +30,8 @@ log.debug('editform loaded')
 
 from PyQt5 import QtCore, QtWidgets
 from PyQt5.QtCore import pyqtSlot, QSize
-from PyQt5.QtWidgets import QDialog, QButtonGroup, QDialogButtonBox, QFormLayout, QLineEdit, QRadioButton, \
-    QStyle, QStylePainter, QStyleOptionTab, QTabBar, QTabWidget, QVBoxLayout, QWidget
+from PyQt5.QtWidgets import QAbstractButton, QDialog, QButtonGroup, QDialogButtonBox, QFormLayout, QLineEdit, \
+    QRadioButton, QStyle, QStylePainter, QStyleOptionTab, QTabBar, QTabWidget, QVBoxLayout, QWidget
 
 from openlp.core.common import translate, is_macosx
 from openlp.core.lib import build_icon
@@ -452,7 +452,7 @@ class SourceSelectSingle(QDialog):
         selected = super(SourceSelectSingle, self).exec()
         return selected
 
-    @pyqtSlot(object)
+    @pyqtSlot(QAbstractButton)
     def button_clicked(self, button):
         """
         Checks which button was clicked
diff --git a/tests/functional/openlp_core_lib/test_projector_pjlink1.py b/tests/functional/openlp_core_lib/test_projector_pjlink1.py
index 829ec322f..4482f6d22 100644
--- a/tests/functional/openlp_core_lib/test_projector_pjlink1.py
+++ b/tests/functional/openlp_core_lib/test_projector_pjlink1.py
@@ -29,7 +29,7 @@ from openlp.core.lib.projector.pjlink1 import PJLink1
 from openlp.core.lib.projector.constants import E_PARAMETER, ERROR_STRING, S_OFF, S_STANDBY, S_WARMUP, S_ON, \
     S_COOLDOWN, PJLINK_POWR_STATUS
 
-from tests.functional import patch
+from tests.functional import patch, MagicMock
 from tests.resources.projector.data import TEST_PIN, TEST_SALT, TEST_CONNECT_AUTHENTICATE, TEST_HASH
 
 pjlink_test = PJLink1(name='test', ip='127.0.0.1', pin=TEST_PIN, no_poll=True)