diff --git a/src/core.py b/src/core.py
index c1220e4b..29748f4b 100644
--- a/src/core.py
+++ b/src/core.py
@@ -45,6 +45,7 @@ from contact import Contact, Resource
 from text_buffer import TextBuffer
 from keyboard import read_char
 from theming import get_theme
+from windows import g_lock
 
 # http://xmpp.org/extensions/xep-0045.html#errorstatus
 ERROR_AND_STATUS_CODES = {
@@ -67,8 +68,6 @@ possible_show = {'available':None,
                  'xa':'xa'
                  }
 
-resize_lock = threading.Lock()
-
 Status = collections.namedtuple('Status', 'show message')
 
 class Core(object):
@@ -198,14 +197,16 @@ class Core(object):
         """
         Resize the global_information_win only once at each resize.
         """
-        self.information_win.resize(self.information_win_size, tabs.Tab.width,
-                                          tabs.Tab.height - 2 - self.information_win_size, 0)
+        with g_lock:
+            self.information_win.resize(self.information_win_size, tabs.Tab.width,
+                                        tabs.Tab.height - 2 - self.information_win_size, 0)
 
     def resize_global_info_bar(self):
         """
         Resize the GlobalInfoBar only once at each resize
         """
-        self.tab_win.resize(1, tabs.Tab.width, tabs.Tab.height - 2, 0)
+        with g_lock:
+            self.tab_win.resize(1, tabs.Tab.width, tabs.Tab.height - 2, 0)
 
     def on_exception(self, typ, value, trace):
         """
@@ -692,7 +693,7 @@ class Core(object):
         tabs.Tab.resize(self.stdscr)
         self.resize_global_information_win()
         self.resize_global_info_bar()
-        with resize_lock:
+        with g_lock:
             for tab in self.tabs:
                 if config.get('lazy_resize', 'true') == 'true':
                     tab.need_resize = True
diff --git a/src/windows.py b/src/windows.py
index 42c9bfa0..790dd858 100644
--- a/src/windows.py
+++ b/src/windows.py
@@ -24,7 +24,7 @@ import curses
 import string
 from config import config
 
-from threading import Lock
+from threading import RLock
 
 from contact import Contact, Resource
 from roster import RosterGroup, roster
@@ -46,7 +46,7 @@ allowed_color_digits = ('0', '1', '2', '3', '4', '5', '6', '7')
 # first is a bool telling if this is the first line of the message.
 Line = collections.namedtuple('Line', 'msg start_pos end_pos')
 
-g_lock = Lock()
+g_lock = RLock()
 
 LINES_NB_LIMIT = 4096
 
@@ -79,7 +79,8 @@ class Win(object):
         """
         Override if something has to be done on resize
         """
-        self._resize(height, width, y, x)
+        with g_lock:
+            self._resize(height, width, y, x)
 
     def _refresh(self):
         self._win.noutrefresh()
@@ -255,10 +256,11 @@ class UserList(Win):
             self._refresh()
 
     def resize(self, height, width, y, x):
-        self._resize(height, width, y, x)
-        self._win.attron(to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
-        self._win.vline(0, 0, curses.ACS_VLINE, self.height)
-        self._win.attroff(to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
+        with g_lock:
+            self._resize(height, width, y, x)
+            self._win.attron(to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
+            self._win.vline(0, 0, curses.ACS_VLINE, self.height)
+            self._win.attroff(to_curses_attr(get_theme().COLOR_VERTICAL_SEPARATOR))
 
 class Topic(Win):
     def __init__(self):
@@ -674,9 +676,10 @@ class TextWin(Win):
             self.addstr(' ')
 
     def resize(self, height, width, y, x, room=None):
-        self._resize(height, width, y, x)
-        if room:
-            self.rebuild_everything(room)
+        with g_lock:
+            self._resize(height, width, y, x)
+            if room:
+                self.rebuild_everything(room)
 
     def rebuild_everything(self, room):
         self.built_lines = []