diff --git a/layout/generic/nsTextFrameThebes.cpp b/layout/generic/nsTextFrameThebes.cpp
index 0953044c876c..25988c4a70d1 100644
--- a/layout/generic/nsTextFrameThebes.cpp
+++ b/layout/generic/nsTextFrameThebes.cpp
@@ -6628,8 +6628,7 @@ RoundOut(const gfxRect& aRect)
 nsRect
 nsTextFrame::ComputeTightBounds(gfxContext* aContext) const
 {
-  if ((GetStyleContext()->HasTextDecorationLines() &&
-       eCompatibility_NavQuirks == PresContext()->CompatibilityMode()) ||
+  if (GetStyleContext()->HasTextDecorationLines() ||
       (GetStateBits() & TEXT_HYPHEN_BREAK)) {
     // This is conservative, but OK.
     return GetVisualOverflowRect();