diff --git a/overlay/frameworks/base/packages/SystemUI/res/values/dimens.xml b/overlay/frameworks/base/packages/SystemUI/res/values/dimens.xml
index 416b504..3c0cfd9 100644
--- a/overlay/frameworks/base/packages/SystemUI/res/values/dimens.xml
+++ b/overlay/frameworks/base/packages/SystemUI/res/values/dimens.xml
@@ -15,5 +15,9 @@
     <!--  Location on the screen of the center of the physical power button. This is a reasonable
     default that should be overridden by device-specific overlays.  -->
     <dimen name="physical_power_button_center_screen_location_y">980px</dimen>
+
+    <!-- Microns/ums (1000 um = 1mm) per pixel for the given device. If unspecified, UI that
+         relies on this value will not be sized correctly. -->
+    <item name="pixel_pitch" format="float" type="dimen">50.4</item>
 </resources>