diff --git a/layout/generic/nsLineLayout.cpp b/layout/generic/nsLineLayout.cpp
index e05a3dbfb..2312bba07 100644
--- a/layout/generic/nsLineLayout.cpp
+++ b/layout/generic/nsLineLayout.cpp
@@ -401,8 +401,10 @@ nsLineLayout::NewPerSpanData()
   psd->mFrame = nullptr;
   psd->mFirstFrame = nullptr;
   psd->mLastFrame = nullptr;
+  psd->mReflowInput = nullptr;
   psd->mContainsFloat = false;
   psd->mHasNonemptyContent = false;
+  psd->mBaseline = nullptr;
 
 #ifdef DEBUG
   outerLineLayout->mSpansAllocated++;