diff --git a/packages/SystemUI/src/com/android/systemui/shade/ShadeHeaderController.kt b/packages/SystemUI/src/com/android/systemui/shade/ShadeHeaderController.kt
index 8789a8b3b7f4d..6c4d8fb03766f 100644
--- a/packages/SystemUI/src/com/android/systemui/shade/ShadeHeaderController.kt
+++ b/packages/SystemUI/src/com/android/systemui/shade/ShadeHeaderController.kt
@@ -266,6 +266,7 @@ constructor(
                 lastInsets?.let { updateConstraintsForInsets(header, it) }
                 updateResources()
                 updateCarrierGroupPadding()
+                clock.onDensityOrFontScaleChanged()
             }
         }
 
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java b/packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java
index 6875b523a9621..f9943729ac7d9 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/policy/Clock.java
@@ -374,6 +374,13 @@ public class Clock extends TextView implements
 
     @Override
     public void onDensityOrFontScaleChanged() {
+        reloadDimens();
+    }
+
+    private void reloadDimens() {
+        // reset mCachedWidth so the new width would be updated properly when next onMeasure
+        mCachedWidth = -1;
+
         FontSizeUtils.updateFontSize(this, R.dimen.status_bar_clock_size);
         setPaddingRelative(
                 mContext.getResources().getDimensionPixelSize(