diff --git a/Makefile b/Makefile
index 72d3974..b7e3c37 100644
--- a/Makefile
+++ b/Makefile
@@ -16,7 +16,7 @@ BOARD_REVISION_MAJOR ?= 1
 BOARD_REVISION_MINOR ?= 4
 
 VERSION_MAJOR = 1
-VERSION_MINOR = 0
+VERSION_MINOR = 1
 
 CROSS=arm-none-eabi-
 
diff --git a/usb.c b/usb.c
index 9518a05..1b15eab 100644
--- a/usb.c
+++ b/usb.c
@@ -259,7 +259,7 @@ char *get_serial_number_string(void)
 		}
 		bitsLeft -= 5;
 		int index = (buffer >> bitsLeft) & 0x1f;
-		buf[count] = index + (index < 26 ? 'A' : '2');  // Base32
+		buf[count] = index + (index < 26 ? 'A' : '2' - 26);  // Base32
 	}
 
 	return buf;