diff --git a/gui/qt/installwizard.py b/gui/qt/installwizard.py
index f2a7a4e2..fc5b440a 100644
--- a/gui/qt/installwizard.py
+++ b/gui/qt/installwizard.py
@@ -527,10 +527,10 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
         grid.addWidget(m_label, 1, 0)
         grid.addWidget(m_edit, 1, 1)
         def on_m(m):
-            m_label.setText(_('Require %d signatures')%m)
+            m_label.setText(_('Require {0} signatures').format(m))
             cw.set_m(m)
         def on_n(n):
-            n_label.setText(_('From %d cosigners')%n)
+            n_label.setText(_('From {0} cosigners').format(n))
             cw.set_n(n)
             m_edit.setMaximum(n)
         n_edit.valueChanged.connect(on_n)
diff --git a/gui/qt/network_dialog.py b/gui/qt/network_dialog.py
index d423202f..961b9aee 100644
--- a/gui/qt/network_dialog.py
+++ b/gui/qt/network_dialog.py
@@ -355,14 +355,14 @@ class NetworkChoiceLayout(object):
         height_str = "%d "%(self.network.get_local_height()) + _('blocks')
         self.height_label.setText(height_str)
         n = len(self.network.get_interfaces())
-        status = _("Connected to %d nodes.")%n if n else _("Not connected")
+        status = _("Connected to {0} nodes.").format(n) if n else _("Not connected")
         self.status_label.setText(status)
         chains = self.network.get_blockchains()
         if len(chains)>1:
             chain = self.network.blockchain()
             checkpoint = chain.get_checkpoint()
             name = chain.get_name()
-            msg = _('Chain split detected at block %d')%checkpoint + '\n'
+            msg = _('Chain split detected at block {0}').format(checkpoint) + '\n'
             msg += (_('You are following branch') if auto_connect else _('Your server is on branch'))+ ' ' + name
             msg += ' (%d %s)' % (chain.get_branch_size(), _('blocks'))
         else:
diff --git a/gui/qt/seed_dialog.py b/gui/qt/seed_dialog.py
index 62ad9584..f1a4e674 100644
--- a/gui/qt/seed_dialog.py
+++ b/gui/qt/seed_dialog.py
@@ -35,7 +35,7 @@ from .qrtextedit import ShowQRTextEdit, ScanQRTextEdit
 def seed_warning_msg(seed):
     return ''.join([
         "<p>",
-        _("Please save these %d words on paper (order is important). "),
+        _("Please save these {0} words on paper (order is important). "),
         _("This seed will allow you to recover your wallet in case "
           "of computer failure."),
         "</p>",
@@ -45,7 +45,7 @@ def seed_warning_msg(seed):
         "<li>" + _("Never type it on a website.") + "</li>",
         "<li>" + _("Do not store it electronically.") + "</li>",
         "</ul>"
-    ]) % len(seed.split())
+    ]).format(len(seed.split()))
 
 
 class SeedLayout(QVBoxLayout):