diff --git a/src/MahApps.Metro/Themes/DateTimePicker.xaml b/src/MahApps.Metro/Themes/DateTimePicker.xaml
index aca2bff2a6..123bea1c97 100644
--- a/src/MahApps.Metro/Themes/DateTimePicker.xaml
+++ b/src/MahApps.Metro/Themes/DateTimePicker.xaml
@@ -133,6 +133,7 @@
                                 Background="{TemplateBinding Background}"
                                 BorderBrush="{TemplateBinding BorderBrush}"
                                 BorderThickness="{TemplateBinding BorderThickness}"
+                                CornerRadius="{TemplateBinding Controls:ControlsHelper.CornerRadius}"
                                 SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
                         <Grid x:Name="PART_InnerGrid" Margin="{TemplateBinding Padding}">
                             <Grid.ColumnDefinitions>