--- a/layout/generic/TextDrawTarget.h
+++ b/layout/generic/TextDrawTarget.h
@@ -58,24 +58,21 @@ public:
   {
     SetPermitSubpixelAA(!aItem->IsSubpixelAADisabled());
 
     // Compute clip/bounds
     auto appUnitsPerDevPixel = aItem->Frame()->PresContext()->AppUnitsPerDevPixel();
     LayoutDeviceRect layoutBoundsRect = LayoutDeviceRect::FromAppUnits(
         aBounds, appUnitsPerDevPixel);
     LayoutDeviceRect layoutClipRect = layoutBoundsRect;
+    mBoundsRect = aSc.ToRelativeLayoutRect(layoutBoundsRect);
 
-    auto clip = aItem->GetClip();
-    if (clip.HasClip()) {
-      layoutClipRect = LayoutDeviceRect::FromAppUnits(
-                  clip.GetClipRect(), appUnitsPerDevPixel);
-    }
-
-    mBoundsRect = aSc.ToRelativeLayoutRect(layoutBoundsRect);
+    // Add 1 pixel of dirty area around clip rect to allow us to paint
+    // antialiased pixels beyond the measured text extents.
+    layoutClipRect.Inflate(1);
     mClipRect = aSc.ToRelativeLayoutRect(layoutClipRect);
 
     mBackfaceVisible = !aItem->BackfaceIsHidden();
 
     mBuilder.Save();
   }
 
   // Prevent this from being copied