diff --git a/line.py b/line.py
index fab8a214be..8d981223df 100644
--- a/line.py
+++ b/line.py
@@ -87,8 +87,8 @@ class EnterLines(Wizard):
                 'type': 'form',
                 'object': 'timesheet.enter_lines.init',
                 'state': [
-                    ('end', 'Cancel', 'gtk-cancel'),
-                    ('enter', 'Enter', 'gtk-ok', True),
+                    ('end', 'Cancel', 'tryton-cancel'),
+                    ('enter', 'Enter', 'tryton-ok', True),
                 ],
             },
         },
@@ -177,8 +177,8 @@ class OpenHoursEmployee(Wizard):
                 'type': 'form',
                 'object': 'timesheet.open_hours_employee.init',
                 'state': [
-                    ('end', 'Cancel', 'gtk-cancel'),
-                    ('open', 'Open', 'gtk-ok', True),
+                    ('end', 'Cancel', 'tryton-cancel'),
+                    ('open', 'Open', 'tryton-ok', True),
                 ],
             },
         },
diff --git a/work_type.py b/work_type.py
index 398db3fe06..4557583c2b 100644
--- a/work_type.py
+++ b/work_type.py
@@ -127,8 +127,8 @@ class OpenWorkType(Wizard):
                 'type': 'form',
                 'object': 'timesheet.work_type.open.init',
                 'state': [
-                    ('end', 'Cancel', 'gtk-cancel'),
-                    ('open', 'Open', 'gtk-ok', True),
+                    ('end', 'Cancel', 'tryton-cancel'),
+                    ('open', 'Open', 'tryton-ok', True),
                 ],
             },
         },