diff -Naur tabbed-0.3/tabbed.c tabbed-mb-fix//tabbed.c
--- tabbed-0.3/tabbed.c	2010-11-26 20:25:42.414423844 +0100
+++ tabbed-mb-fix//tabbed.c	2010-11-26 20:26:30.497757177 +0100
@@ -108,6 +108,7 @@
 static unsigned long getcolor(const char *colstr);
 static Client *getfirsttab();
 static Bool gettextprop(Window w, Atom atom, char *text, unsigned int size);
+static Bool settextprop(Window w, Atom atom, char *text);
 static void initfont(const char *fontstr);
 static Bool isprotodel(Client *c);
 static void keypress(const XEvent *e);
@@ -474,6 +475,21 @@
 	return True;
 }
 
+Bool
+settextprop(Window w, Atom atom, char *text) {
+	XTextProperty name;
+
+	if(!text)
+		return False;
+	if(XmbTextListToTextProperty(dpy, &text, 1, XStdICCTextStyle, &name) != Success)
+		return False;
+
+	XSetTextProperty(dpy, w, &name, atom);
+	XFree(name.value);
+
+	return True;
+}
+
 void
 initfont(const char *fontstr) {
 	char *def, **missing;
@@ -822,8 +838,10 @@
 void
 updatetitle(Client *c) {
 	gettextprop(c->win, XA_WM_NAME, c->name, sizeof c->name);
-	if(sel == c)
-		XStoreName(dpy, win, c->name);
+	if(sel == c) {
+		if (settextprop(win, XA_WM_NAME, c->name) == False)
+			XStoreName(dpy, win, c->name);
+	}
 	drawbar();
 }