diff --git a/BaseTools/Source/C/GenVtf/GenVtf.c b/BaseTools/Source/C/GenVtf/GenVtf.c
index b68d86a97e..006822a79b 100644
--- a/BaseTools/Source/C/GenVtf/GenVtf.c
+++ b/BaseTools/Source/C/GenVtf/GenVtf.c
@@ -112,8 +112,8 @@ Returns:
 --*/
 {
   CHAR8  TemStr[5] = "0000";
-  unsigned Major;
-  unsigned Minor;
+  int    Major;
+  int    Minor;
   UINTN Length;
 
   Major = 0;