--- a/layout/generic/nsLineBox.cpp
+++ b/layout/generic/nsLineBox.cpp
@@ -47,19 +47,16 @@ nsLineBox::nsLineBox(nsIFrame* aFrame, i
     NS_ASSERTION(aIsBlock == f->IsBlockOutside(),
                  "wrong kind of child frame");
   }
 #endif
 
   static_assert(NS_STYLE_CLEAR_MAX <= 15,
                 "FlagBits needs more bits to store the full range of "
                 "break type ('clear') values");
-#if NS_STYLE_CLEAR_NONE > 0
-  mFlags.mBreakType = NS_STYLE_CLEAR_NONE;
-#endif
   mChildCount = aCount;
   MarkDirty();
   mFlags.mBlock = aIsBlock;
 }
 
 nsLineBox::~nsLineBox()
 {
   MOZ_COUNT_DTOR(nsLineBox);