diff --git a/trytond/ir/ui/icon.py b/trytond/ir/ui/icon.py
index b42a16f229..2f419a358a 100644
--- a/trytond/ir/ui/icon.py
+++ b/trytond/ir/ui/icon.py
@@ -50,5 +50,5 @@ class Icon(ModelSQL, ModelView):
 
     def get_icon(self, name):
         path = os.path.join(self.module, self.path.replace('/', os.sep))
-        with file_open(path, subdir='modules') as fp:
+        with file_open(path, subdir='modules', mode='rb') as fp:
             return fp.read()
diff --git a/trytond/ir/ui/view.py b/trytond/ir/ui/view.py
index 24cfc3ac95..0542260e2d 100644
--- a/trytond/ir/ui/view.py
+++ b/trytond/ir/ui/view.py
@@ -194,7 +194,7 @@ class View(ModelSQL, ModelView):
         if self.name and self.module:
             path = os.path.join(self.module, 'view', self.name + '.xml')
             try:
-                with file_open(path, subdir='modules') as fp:
+                with file_open(path, subdir='modules', mode='rb') as fp:
                     value = fp.read()
             except IOError:
                 pass