--- a/src/network/playergamelistings.h	2010-11-08 13:49:25.000000000 +0100
+++ b/src/network/playergamelistings.h	2010-11-08 13:52:24.000000000 +0100
@@ -66,21 +66,21 @@
 	bool hidden;
 	PlayerListing() : id(0), 
 	online(0),
-	name(0),
-	notnickname(0),
-	info(0),
-	idletime(0),
+	name(QString::null),
+	notnickname(QString::null),
+	info(QString::null),
+	idletime(QString::null),
 	seconds_idle(0),
-	rank(0),
+	rank(QString::null),
 	rank_score(0),
-	country(0),
+	country(QString::null),
 	wins(0), 
 	losses(0),
 	rated_games(0),
 	observing(0),
 	playing(0), 
-	extInfo(0),
-	email_address(0),
+	extInfo(QString::null),
+	email_address(QString::null),
 	nmatch(0),
 	nmatch_handicapMin(0),
 	specialbyte(0),
@@ -189,7 +189,7 @@
 	_white_rank_score(0), 
 	_black_rank_score(0), 
 	observers(0), 
-	result(0),
+	result(QString::null),
 	flags(IN_PROGRESS),
 	rated(0), 
 	owner_id(0), 
--- a/src/board/board.h	2010-11-08 13:57:26.000000000 +0100
+++ b/src/board/board.h	2010-11-08 13:58:17.000000000 +0100
@@ -50,7 +50,7 @@
 
 	void removeGhosts();
 	void setVarGhost(StoneColor c, int x, int y);
-	void setMark(int x, int y, MarkType t, bool update=true, QString txt=0, bool overlay=true);
+	void setMark(int x, int y, MarkType t, bool update=true, QString txt=QString::null, bool overlay=true);
 	Mark* hasMark(int x, int y);
 	void removeMark(int x, int y, bool update = false);
 	void removeDeadMarks();
--- a/src/board/boardwindow.h	2010-11-08 14:21:19.000000000 +0100
+++ b/src/board/boardwindow.h	2010-11-08 14:21:39.000000000 +0100
@@ -45,7 +45,7 @@
 	~BoardWindow();
 	
 	void init();
-	bool loadSGF(const QString fileName, const QString SGFLoaded=0);
+	bool loadSGF(const QString fileName, const QString SGFLoaded=QString::null);
 	bool doSave(QString fileName, bool force);
 	QString getCandidateFileName();
 
--- a/src/sgf/sgfparser.h	2010-11-08 14:29:05.000000000 +0100
+++ b/src/sgf/sgfparser.h	2010-11-08 14:29:27.000000000 +0100
@@ -51,7 +51,7 @@
 */
 protected:
 	int minPos(int n1, int n2, int n3);
-	bool corruptSgf(int where=0, QString reason=NULL);
+	bool corruptSgf(int where=0, QString reason=QString::null);
 
 	bool parseProperty(const QString &toParse, const QString &prop, QString &result);