diff --git a/BaseTools/Source/C/GenFw/GenFw.c b/BaseTools/Source/C/GenFw/GenFw.c
index 9ffc4c5b01..22e4e7283c 100644
--- a/BaseTools/Source/C/GenFw/GenFw.c
+++ b/BaseTools/Source/C/GenFw/GenFw.c
@@ -3158,7 +3158,7 @@ Returns:
 {
   CHAR8  Line[MAX_LINE_LEN];
   CHAR8  *cptr;
-  unsigned ScannedData = 0;
+  int    ScannedData = 0;
 
   Line[MAX_LINE_LEN - 1]  = 0;
   while (1) {