diff --git a/Source/Fractorium/FinalRenderDialog.ui b/Source/Fractorium/FinalRenderDialog.ui
index 16f57ac..ab56401 100644
--- a/Source/Fractorium/FinalRenderDialog.ui
+++ b/Source/Fractorium/FinalRenderDialog.ui
@@ -1309,7 +1309,7 @@
   <customwidget>
    <class>DoubleSpinBox</class>
    <extends>QWidget</extends>
-   <header>doublespinbox.h</header>
+   <header>DoubleSpinBox.h</header>
   </customwidget>
  </customwidgets>
  <tabstops>
diff --git a/Source/Fractorium/OptionsDialog.ui b/Source/Fractorium/OptionsDialog.ui
index 651758a..4602123 100644
--- a/Source/Fractorium/OptionsDialog.ui
+++ b/Source/Fractorium/OptionsDialog.ui
@@ -947,12 +947,12 @@
   <customwidget>
    <class>SpinBox</class>
    <extends>QWidget</extends>
-   <header>spinbox.h</header>
+   <header>SpinBox.h</header>
   </customwidget>
   <customwidget>
    <class>DoubleSpinBox</class>
    <extends>QWidget</extends>
-   <header>doublespinbox.h</header>
+   <header>DoubleSpinBox.h</header>
   </customwidget>
  </customwidgets>
  <tabstops>