diff --git a/dlls/msvcrt/msvcrt.h b/dlls/msvcrt/msvcrt.h
index 9395b7ecac8..7e854704b10 100644
--- a/dlls/msvcrt/msvcrt.h
+++ b/dlls/msvcrt/msvcrt.h
@@ -314,6 +314,7 @@ extern unsigned int MSVCRT___lc_codepage;
 extern int MSVCRT___lc_collate_cp;
 extern WORD MSVCRT__ctype [257];
 extern BOOL initial_locale DECLSPEC_HIDDEN;
+extern WORD *MSVCRT__pwctype;
 
 void msvcrt_set_errno(int) DECLSPEC_HIDDEN;
 #if _MSVCR_VER >= 80
diff --git a/dlls/msvcrt/wcs.c b/dlls/msvcrt/wcs.c
index 5188d4f8604..4be3de5b2da 100644
--- a/dlls/msvcrt/wcs.c
+++ b/dlls/msvcrt/wcs.c
@@ -1919,7 +1919,17 @@ MSVCRT_size_t CDECL MSVCRT_wcrtomb( char *dst, MSVCRT_wchar_t ch, MSVCRT_mbstate
  */
 INT CDECL MSVCRT__iswctype_l( MSVCRT_wchar_t wc, MSVCRT_wctype_t type, MSVCRT__locale_t locale )
 {
-    return (get_char_typeW(wc) & 0xffff) & type;
+    WORD ct;
+
+    if (wc == MSVCRT_WEOF) return 0;
+    if (wc < 256) return MSVCRT__pwctype[wc] & type;
+
+    if (!GetStringTypeW(CT_CTYPE1, &wc, 1, &ct))
+    {
+        ERR("GetStringTypeW failed for %x\n", wc);
+        return 0;
+    }
+    return ct & type;
 }
 
 /*********************************************************************
@@ -1927,7 +1937,7 @@ INT CDECL MSVCRT__iswctype_l( MSVCRT_wchar_t wc, MSVCRT_wctype_t type, MSVCRT__l
  */
 INT CDECL MSVCRT_iswctype( MSVCRT_wchar_t wc, MSVCRT_wctype_t type )
 {
-    return (get_char_typeW(wc) & 0xfff) & type;
+    return MSVCRT__iswctype_l( wc, type, NULL );
 }
 
 /*********************************************************************
diff --git a/dlls/ucrtbase/tests/misc.c b/dlls/ucrtbase/tests/misc.c
index e4928b194fe..a5f78925fd2 100644
--- a/dlls/ucrtbase/tests/misc.c
+++ b/dlls/ucrtbase/tests/misc.c
@@ -557,17 +557,15 @@ static void test_isblank(void)
     for(c = 0; c <= 0xffff; c++) {
         if(c == '\t' || c == ' ' || c == 0x3000 || c == 0xfeff) {
             if(c == '\t')
-                todo_wine ok(!_iswctype_l(c, _BLANK, NULL), "tab shouldn't be blank\n");
+                ok(!_iswctype_l(c, _BLANK, NULL), "tab shouldn't be blank\n");
             else
                 ok(_iswctype_l(c, _BLANK, NULL), "%d should be blank\n", c);
             ok(iswblank(c), "%d should be blank\n", c);
             ok(_iswblank_l(c, NULL), "%d should be blank\n", c);
         } else {
-            todo_wine_if(c == 0xa0) {
-                ok(!_iswctype_l(c, _BLANK, NULL), "%d shouldn't be blank\n", c);
-                ok(!iswblank(c), "%d shouldn't be blank\n", c);
-                ok(!_iswblank_l(c, NULL), "%d shouldn't be blank\n", c);
-            }
+            ok(!_iswctype_l(c, _BLANK, NULL), "%d shouldn't be blank\n", c);
+            ok(!iswblank(c), "%d shouldn't be blank\n", c);
+            ok(!_iswblank_l(c, NULL), "%d shouldn't be blank\n", c);
         }
     }
 }