diff --git a/editor/base/nsEditor.cpp b/editor/base/nsEditor.cpp
index 908441873921..a6b32413612e 100644
--- a/editor/base/nsEditor.cpp
+++ b/editor/base/nsEditor.cpp
@@ -147,6 +147,7 @@ nsEditor::nsEditor()
 ,  mPlaceHolderBatch(0)
 ,  mTxnStartNode(nsnull)
 ,  mTxnStartOffset(0)
+,  mShouldTxnSetSelection(PR_TRUE)
 ,  mInIMEMode(PR_FALSE)
 ,  mIMETextRangeList(nsnull)
 ,  mIMETextNode(nsnull)
diff --git a/editor/libeditor/base/nsEditor.cpp b/editor/libeditor/base/nsEditor.cpp
index 908441873921..a6b32413612e 100644
--- a/editor/libeditor/base/nsEditor.cpp
+++ b/editor/libeditor/base/nsEditor.cpp
@@ -147,6 +147,7 @@ nsEditor::nsEditor()
 ,  mPlaceHolderBatch(0)
 ,  mTxnStartNode(nsnull)
 ,  mTxnStartOffset(0)
+,  mShouldTxnSetSelection(PR_TRUE)
 ,  mInIMEMode(PR_FALSE)
 ,  mIMETextRangeList(nsnull)
 ,  mIMETextNode(nsnull)