diff --git a/src/windows.py b/src/windows.py
index 9fa3e705..c94de15e 100644
--- a/src/windows.py
+++ b/src/windows.py
@@ -634,7 +634,7 @@ class TextWin(Win):
             self._win.attrset(0)
             for y, line in enumerate(lines):
                 if not line:
-                    self.write_line_separator()
+                    self.write_line_separator(y)
                 else:
                     self.write_text(y, (3 if line.msg.nickname else 1) + len(line.msg.str_time)+len(truncate_nick(line.msg.nickname) or ''), line.msg.txt[line.start_pos:line.end_pos])
                 if y != self.height-1:
@@ -642,8 +642,8 @@ class TextWin(Win):
             self._win.attrset(0)
             self._refresh()
 
-    def write_line_separator(self):
-        self.addnstr('- '*(self.width//2-1)+'-', self.width, to_curses_attr(get_theme().COLOR_NEW_TEXT_SEPARATOR))
+    def write_line_separator(self, y):
+        self.addnstr(y, 0, '- '*(self.width//2-1)+'-', self.width, to_curses_attr(get_theme().COLOR_NEW_TEXT_SEPARATOR))
 
     def write_text(self, y, x, txt):
         """
diff --git a/update.sh b/update.sh
index 510bbb07..c2dba40e 100755
--- a/update.sh
+++ b/update.sh
@@ -9,6 +9,15 @@
 echo 'Updating poezio'
 git pull origin master
 
+make
+if [ $? -ne 0 ]
+then
+    echo -e "It seems that you do not have the python development"\
+        "files.\nSearch for a package named python3-dev or python3-devel"\
+        "in your repos."
+    exit -1
+fi
+
 if [ -e "SleekXMPP" ]
 then
     echo "Updating SleekXMPP"