diff --git a/dlls/msvcrt/mbcs.c b/dlls/msvcrt/mbcs.c
index 1040a0c6dd0..2cedb28fd52 100644
--- a/dlls/msvcrt/mbcs.c
+++ b/dlls/msvcrt/mbcs.c
@@ -446,6 +446,7 @@ unsigned char* _mbschr(const unsigned char* str, unsigned int c)
 
 /*********************************************************************
  *		_mbsnccnt(MSVCRT.@)
+ * 'c' is for 'character'.
  */
 unsigned int _mbsnccnt(const unsigned char *str, unsigned int len)
 {
@@ -468,6 +469,30 @@ unsigned int _mbsnccnt(const unsigned char *str, unsigned int len)
   return min(strlen(str), len); /* ASCII CP */
 }
 
+/*********************************************************************
+ *		_mbsnbcnt(MSVCRT.@)
+ * 'b' is for byte count.
+ */
+unsigned int _mbsnbcnt(const unsigned char *str, unsigned int len)
+{
+  const unsigned char *xstr = str;
+
+  if(MSVCRT___mb_cur_max > 1)
+  {
+    while(*xstr && len-- > 0)
+    {
+      if(MSVCRT_isleadbyte(*xstr))
+      {
+        xstr++;
+        len--;
+      }
+      xstr++;
+    }
+    return xstr-str;
+  }
+  return min(strlen(str), len); /* ASCII CP */
+}
+
 
 /*********************************************************************
  *		_mbsncat(MSVCRT.@)
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 90904a36481..59476224509 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -367,7 +367,7 @@ debug_channels (msvcrt)
 @ cdecl _mbslwr(str) _mbslwr
 @ stub _mbsnbcat #(str str long)
 @ cdecl _mbsnbcmp(str str long) _mbsnbcmp
-@ stub _mbsnbcnt #(ptr long)
+@ cdecl _mbsnbcnt(ptr long) _mbsnbcnt
 @ stub _mbsnbcoll #(str str long)
 @ cdecl _mbsnbcpy(ptr str long) _mbsnbcpy
 @ stub _mbsnbicmp #(str str long)
@@ -768,3 +768,5 @@ debug_channels (msvcrt)
 @ cdecl wctomb(ptr long) MSVCRT_wctomb
 @ varargs wprintf(wstr) MSVCRT_wprintf
 @ stub wscanf #(wstr) varargs
+@ stub _Gettnames
+@ stub __lc_collate_cp