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diff --git a/src/pal/tests/palsuite/c_runtime/_mbsninc/test1/test1.cpp b/src/pal/tests/palsuite/c_runtime/_mbsninc/test1/test1.cpp
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+++ b/src/pal/tests/palsuite/c_runtime/_mbsninc/test1/test1.cpp
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*============================================================================
+**
+** Source: test1.c
+**
+** Purpose:
+** Ensure that this functions increases a string pointer by n characters.
+** Use a for loop, and increase the pointer by a different number of characters
+** on each iteration, ensure that it is indeed pointing to the correct location
+** each time. The second test checks to see if you attempt to increase the
+** pointer past the end of the string, the pointer should just point at the
+** last character.
+**
+**
+**==========================================================================*/
+
+#include <palsuite.h>
+
+/*
+ * Note: it seems like these functions would only be useful if they
+ * didn't assume a character was equivalent to a single byte. Be that
+ * as it may, I haven't seen a way to get it to behave otherwise.
+ */
+
+int __cdecl main(int argc, char *argv[])
+{
+ unsigned char str[] = {0xC0, 0x80, 0xC0, 0x80, 0};
+ int i=0;
+ unsigned char *ret=NULL;
+
+ /*
+ * Initialize the PAL and return FAIL if this fails
+ */
+ if (0 != (PAL_Initialize(argc, argv)))
+ {
+ return FAIL;
+ }
+
+ for (i=0; i<5; i++)
+ {
+ ret = _mbsninc(str, i);
+ if (ret != str + i)
+ {
+ Fail ("ERROR: _mbsninc returned %p. Expected %p\n", ret, str+i);
+ }
+ }
+
+ /*
+ * trying to advance past the end of the string should just
+ * return the end.
+ */
+ ret = _mbsninc(str, 5);
+ if (ret != str + 4)
+ {
+ Fail ("ERROR: _mbsninc returned %p. Expected %p\n", ret, str+4);
+ }
+
+
+ PAL_Terminate();
+ return PASS;
+}
+