diff --git a/pym/client/progressbar.py b/pym/client/progressbar.py
index a68a0fa..c189449 100644
--- a/pym/client/progressbar.py
+++ b/pym/client/progressbar.py
@@ -97,7 +97,7 @@ class GProgressBar(NoneProgressBar):
     def setMaximum(self,max):
         '''Установить максимальное значения для прогресса'''
         self.max = max
-        self.kmax = max / 100.0
+        self.kmax = (max / 100.0) or 1.0
 
     def setTitle(self,title):
         '''Установить описания прогресса'''
@@ -205,7 +205,7 @@ org.kde.kdialog.ProgressDialog'
             os.system(env + '/usr/bin/qdbus %s %s maximum %d >/dev/null'\
                       %(self.kdialog,self.suffixSet, 100))
         self.max = max
-        self.kmax = max / 100.0 or 1.0
+        self.kmax = (max / 100.0) or 1.0
 
 
     def setTitle(self,title):