diff --git a/dlls/msvcrt/tests/string.c b/dlls/msvcrt/tests/string.c
index 221ee3c..955a092 100644
--- a/dlls/msvcrt/tests/string.c
+++ b/dlls/msvcrt/tests/string.c
@@ -97,6 +97,7 @@
 static int (__cdecl *p__strnset_s)(char*,size_t,int,size_t);
 static int (__cdecl *p__wcsset_s)(wchar_t*,size_t,wchar_t);
 static size_t (__cdecl *p__mbsnlen)(const unsigned char*, size_t);
+static int (__cdecl *p__mbccpy_s)(unsigned char*, size_t, int*, const unsigned char*);
 
 #define SETNOFAIL(x,y) x = (void*)GetProcAddress(hMsvcrt,y)
 #define SET(x,y) SETNOFAIL(x,y); ok(x != NULL, "Export '%s' not found\n", y)
@@ -373,6 +374,40 @@
     _mbccpy(buf, mbstring);
     expect_bin(buf, "\xb0\xb1\xff", 3);
 
+    if(!p__mbccpy_s) {
+        win_skip("_mbccpy_s tests\n");
+    }else {
+        int err, copied;
+
+        memset(buf, 0xff, sizeof(buf));
+        copied = -1;
+        err = p__mbccpy_s(buf, 0, &copied, mbstring);
+        ok(err == EINVAL, "_mbccpy_s returned %d\n", err);
+        ok(!copied, "copied = %d\n", copied);
+        ok(buf[0] == 0xff, "buf[0] = %x\n", buf[0]);
+
+        memset(buf, 0xff, sizeof(buf));
+        copied = -1;
+        err = p__mbccpy_s(buf, 1, &copied, mbstring);
+        ok(err == ERANGE, "_mbccpy_s returned %d\n", err);
+        ok(!copied, "copied = %d\n", copied);
+        ok(!buf[0], "buf[0] = %x\n", buf[0]);
+
+        memset(buf, 0xff, sizeof(buf));
+        copied = -1;
+        err = p__mbccpy_s(buf, 2, &copied, mbstring);
+        ok(!err, "_mbccpy_s returned %d\n", err);
+        ok(copied == 2, "copied = %d\n", copied);
+        expect_bin(buf, "\xb0\xb1\xff", 3);
+
+        memset(buf, 0xff, sizeof(buf));
+        copied = -1;
+        err = p__mbccpy_s(buf, 2, &copied, (unsigned char *)"\xb0");
+        ok(err == EILSEQ, "_mbccpy_s returned %d\n", err);
+        ok(copied == 1, "copied = %d\n", copied);
+        expect_bin(buf, "\x00\xff", 2);
+    }
+
     memset(buf, 0xff, sizeof(buf));
     _mbsncpy(buf, mbstring, 1);
     expect_bin(buf, "\xb0\xb1\xff", 3);
@@ -3286,6 +3321,7 @@
     p__strnset_s = (void*)GetProcAddress(hMsvcrt, "_strnset_s");
     p__wcsset_s = (void*)GetProcAddress(hMsvcrt, "_wcsset_s");
     p__mbsnlen = (void*)GetProcAddress(hMsvcrt, "_mbsnlen");
+    p__mbccpy_s = (void*)GetProcAddress(hMsvcrt, "_mbccpy_s");
 
     /* MSVCRT memcpy behaves like memmove for overlapping moves,
        MFC42 CString::Insert seems to rely on that behaviour */