diff --git a/IntelFspPkg/Library/BaseFspDebugLibSerialPort/DebugLib.c b/IntelFspPkg/Library/BaseFspDebugLibSerialPort/DebugLib.c
index 55a917b918..471659072c 100644
--- a/IntelFspPkg/Library/BaseFspDebugLibSerialPort/DebugLib.c
+++ b/IntelFspPkg/Library/BaseFspDebugLibSerialPort/DebugLib.c
@@ -148,7 +148,7 @@ DebugAssertInternal (
   //
   // Generate the ASSERT() message in Ascii format
   //
-  AsciiStrnCpy (Buffer, sizeof(Buffer), "-> EBP:0x00000000  EIP:0x00000000\n");
+  AsciiStrnCpy (Buffer, "-> EBP:0x00000000  EIP:0x00000000\n", sizeof(Buffer));
   SerialPortWrite ((UINT8 *)"ASSERT DUMP:\n", 13);
   while (Frame != NULL) {
     FillHex ((UINT32)Frame, Buffer + 9);