diff -r 16ea07d420b8 Modules/_cursesmodule.c
--- a/Modules/_cursesmodule.c	Fri Oct 28 12:17:17 2016 +0300
+++ b/Modules/_cursesmodule.c	Fri Oct 28 23:54:56 2016 +0300
@@ -280,7 +280,7 @@ static int
 PyCurses_ConvertToCchar_t(PyCursesWindowObject *win, PyObject *obj,
                           chtype *ch
 #ifdef HAVE_NCURSESW
-                          , cchar_t *wch
+                          , wchar_t *wch
 #endif
                           )
 {
@@ -298,8 +298,9 @@ PyCurses_ConvertToCchar_t(PyCursesWindow
                          PyUnicode_GET_LENGTH(obj));
             return 0;
         }
-        memset(wch->chars, 0, sizeof(wch->chars));
-        wch->chars[0] = buffer[0];
+//         memset(wch->chars, 0, sizeof(wch->chars));
+//         wch->chars[0] = buffer[0];
+        *wch = buffer[0];
         return 2;
 #else
         return PyCurses_ConvertToChtype(win, obj, ch);
@@ -597,7 +598,8 @@ curses_window_addch_impl(PyCursesWindowO
     int type;
     chtype cch;
 #ifdef HAVE_NCURSESW
-    cchar_t wch;
+    wchar_t wch;
+    cchar_t wcval;
 #endif
     const char *funcname;
 
@@ -608,11 +610,11 @@ curses_window_addch_impl(PyCursesWindowO
     type = PyCurses_ConvertToCchar_t(cwself, ch, &cch, &wch);
     if (type == 2) {
         funcname = "add_wch";
-        wch.attr = attr;
+        setcchar(wcval, wch, attr, 0, NULL);
         if (coordinates_group)
-            rtn = mvwadd_wch(cwself->win,y,x, &wch);
+            rtn = mvwadd_wch(cwself->win,y,x, &wcval);
         else {
-            rtn = wadd_wch(cwself->win, &wch);
+            rtn = wadd_wch(cwself->win, &wcval);
         }
     }
     else