diff --git a/dlls/msvcrt/mbcs.c b/dlls/msvcrt/mbcs.c
index 17d585fa1bb..2421011eb5c 100644
--- a/dlls/msvcrt/mbcs.c
+++ b/dlls/msvcrt/mbcs.c
@@ -931,6 +931,33 @@ MSVCRT_size_t _mbsnbcnt(const unsigned char* str, MSVCRT_size_t len)
 }
 
 
+/*********************************************************************
+ *		_mbsnbcat(MSVCRT.@)
+ */
+unsigned char* _mbsnbcat(unsigned char* dst, const unsigned char* src, MSVCRT_size_t len)
+{
+    if(MSVCRT___mb_cur_max > 1)
+    {
+        char *res = dst;
+        while (*dst) {
+	    if (MSVCRT_isleadbyte(*dst++)) {
+		if (*dst) {
+		    dst++;
+		} else {
+		    /* as per msdn overwrite the lead byte in front of '\0' */
+		    dst--;
+		    break;
+		}
+	    }
+	}
+        while (*src && len--) *dst++ = *src++;
+        *dst = '\0';
+        return res;
+    }
+    return strncat(dst, src, len); /* ASCII CP */
+}
+
+
 /*********************************************************************
  *		_mbsncat(MSVCRT.@)
  */
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index f3d8b3fa6cc..8665ea58aa0 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -359,7 +359,7 @@
 @ cdecl _mbsinc(str) _mbsinc
 @ cdecl _mbslen(str) _mbslen
 @ cdecl _mbslwr(str) _mbslwr
-@ stub _mbsnbcat #(str str long)
+@ cdecl _mbsnbcat (str str long) _mbsnbcat
 @ cdecl _mbsnbcmp(str str long) _mbsnbcmp
 @ cdecl _mbsnbcnt(ptr long) _mbsnbcnt
 @ stub _mbsnbcoll #(str str long)