diff --git a/gui/gui_android.py b/gui/gui_android.py
index 60bb0721..44427ff4 100644
--- a/gui/gui_android.py
+++ b/gui/gui_android.py
@@ -825,11 +825,9 @@ def settings_loop():
                         fee = int( 100000000 * Decimal(fee) )
                     except:
                         modal_dialog('error','invalid fee value')
-                    if wallet.fee != fee:
-                        wallet.fee = fee
-                        wallet.save()
-                        set_listview()
-        
+                    wallet.set_fee(fee)
+                    set_listview()
+
             elif pos == "4":
                 if change_password_dialog():
                     set_listview()
diff --git a/gui/gui_classic.py b/gui/gui_classic.py
index fa25c823..2d73b5df 100644
--- a/gui/gui_classic.py
+++ b/gui/gui_classic.py
@@ -2031,9 +2031,7 @@ class ElectrumWindow(QMainWindow):
             QMessageBox.warning(self, _('Error'), _('Invalid value') +': %s'%fee, _('OK'))
             return
 
-        if self.wallet.fee != fee:
-            self.wallet.fee = fee
-            self.wallet.save()
+        self.wallet.set_fee(fee)
         
         nz = unicode(nz_e.text())
         try:
diff --git a/gui/gui_gtk.py b/gui/gui_gtk.py
index 5423a035..3c3718f5 100644
--- a/gui/gui_gtk.py
+++ b/gui/gui_gtk.py
@@ -249,9 +249,7 @@ def run_settings_dialog(wallet, parent):
     except:
         show_message("error")
         return
-    if wallet.fee != fee:
-        wallet.fee = fee
-        wallet.save()
+    wallet.set_fee(fee)
 
     try:
         nz = int( nz )
diff --git a/lib/wallet.py b/lib/wallet.py
index 4950b8d3..9949fcd3 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -873,6 +873,12 @@ class Wallet:
         else:
             return False
 
+    def set_fee(self, fee):
+        if self.fee != fee:
+            self.fee = fee
+            self.config.set_key('fee_per_kb', self.fee, True)
+        
+
     def save(self):
         tx = {}
         for k,v in self.transactions.items():