diff --git a/qtest.c b/qtest.c
index f9695a8ff6322e8ee4c3a3641e6ba34410009f17..04a6dc1f0f187b301a866898243857d95d7a3e8d 100644
--- a/qtest.c
+++ b/qtest.c
@@ -148,7 +148,7 @@ static int hex2nib(char ch)
     } else if (ch >= 'a' && ch <= 'f') {
         return 10 + (ch - 'a');
     } else if (ch >= 'A' && ch <= 'F') {
-        return 10 + (ch - 'a');
+        return 10 + (ch - 'A');
     } else {
         return -1;
     }