diff --git a/LegacyBios/BlockIoDxe/BiosBlkIo.c b/LegacyBios/BlockIoDxe/BiosBlkIo.c
index 47c9cb42b..f269e7900 100644
--- a/LegacyBios/BlockIoDxe/BiosBlkIo.c
+++ b/LegacyBios/BlockIoDxe/BiosBlkIo.c
@@ -34,7 +34,7 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
 #define DBG(...) MemLog(TRUE, 0, __VA_ARGS__)
 #endif
 
-
+#define strncmp AsciiStrnCmp
 //
 // Global data declaration
 //