diff --git a/src/calibre/gui2/dialogs/progress.py b/src/calibre/gui2/dialogs/progress.py
index 53f8110d57..311ad5838f 100644
--- a/src/calibre/gui2/dialogs/progress.py
+++ b/src/calibre/gui2/dialogs/progress.py
@@ -6,7 +6,7 @@ __copyright__ = '2009, Kovid Goyal kovid@kovidgoyal.net'
 __docformat__ = 'restructuredtext en'
 
 from PyQt5.Qt import (
-    QDialog, pyqtSignal, Qt, QVBoxLayout, QLabel, QFont, QProgressBar,
+    QDialog, pyqtSignal, Qt, QVBoxLayout, QLabel, QFont, QProgressBar, QSize,
     QDialogButtonBox, QApplication, QFontMetrics, QHBoxLayout, QIcon)
 
 from calibre.gui2 import elided_text
@@ -145,7 +145,7 @@ class BlockingBusy(QDialog):
         self.font.setPointSize(self.font.pointSize() + 8)
         self.msg.setFont(self.font)
         self.pi = ProgressIndicator(self)
-        self.pi.setDisplaySize(100)
+        self.pi.setDisplaySize(QSize(100, 100))
         self._layout.addWidget(self.pi, 0, Qt.AlignHCenter)
         self._layout.addSpacing(15)
         self._layout.addWidget(self.msg, 0, Qt.AlignHCenter)
diff --git a/src/calibre/gui2/progress_indicator/QProgressIndicator.h b/src/calibre/gui2/progress_indicator/QProgressIndicator.h
index 7e50086e92..4fd25a5232 100644
--- a/src/calibre/gui2/progress_indicator/QProgressIndicator.h
+++ b/src/calibre/gui2/progress_indicator/QProgressIndicator.h
@@ -64,6 +64,7 @@ public slots:
      * \sa displaySize
      */
     void setDisplaySize(QSize size);
+    void setDisplaySize(int size) { setDisplaySize(QSize(size, size)); }
 	void setSizeHint(int size);
 	void setSizeHint(QSize size);
 protected:
diff --git a/src/calibre/gui2/progress_indicator/QProgressIndicator.sip b/src/calibre/gui2/progress_indicator/QProgressIndicator.sip
index 26f145b8fd..93969dcbfb 100644
--- a/src/calibre/gui2/progress_indicator/QProgressIndicator.sip
+++ b/src/calibre/gui2/progress_indicator/QProgressIndicator.sip
@@ -44,6 +44,7 @@ public slots:
     void set_colors(const QColor & dark, const QColor & light);
 
     void setDisplaySize(QSize size);
+    void setDisplaySize(int size);
     void setSizeHint(int size);
     void setSizeHint(QSize size);
 
diff --git a/src/calibre/gui2/toc/main.py b/src/calibre/gui2/toc/main.py
index 45ae431dd3..b9be2e5224 100644
--- a/src/calibre/gui2/toc/main.py
+++ b/src/calibre/gui2/toc/main.py
@@ -1001,7 +1001,7 @@ class TOCEditor(QDialog):  # {{{
         ll = self.ll = QVBoxLayout()
         lw.setLayout(ll)
         self.pi = pi = ProgressIndicator()
-        pi.setDisplaySize(200)
+        pi.setDisplaySize(QSize(200, 200))
         pi.startAnimation()
         ll.addWidget(pi, alignment=Qt.AlignHCenter|Qt.AlignCenter)
         la = self.wait_label = QLabel(_('Loading %s, please wait...')%t)
diff --git a/src/calibre/gui2/tweak_book/save.py b/src/calibre/gui2/tweak_book/save.py
index 6f0f5b33a4..60ef6260d2 100644
--- a/src/calibre/gui2/tweak_book/save.py
+++ b/src/calibre/gui2/tweak_book/save.py
@@ -8,7 +8,7 @@ __copyright__ = '2013, Kovid Goyal <kovid at kovidgoyal.net>'
 import shutil, os, errno
 from threading import Thread
 
-from PyQt5.Qt import (QObject, pyqtSignal, QLabel, QWidget, QHBoxLayout, Qt)
+from PyQt5.Qt import (QObject, pyqtSignal, QLabel, QWidget, QHBoxLayout, Qt, QSize)
 
 from calibre.constants import iswindows
 from calibre.ptempfile import PersistentTemporaryFile
@@ -110,7 +110,7 @@ class SaveWidget(QWidget):
         self.stop()
 
     def start(self):
-        self.pi.setDisplaySize(self.label.height())
+        self.pi.setDisplaySize(QSize(self.label.height(), self.label.height()))
         self.pi.setVisible(True)
         self.pi.startAnimation()
         self.label.setText(_('Saving...'))