diff --git a/hidReader.ino b/hidReader.ino
index 3b6c36b..84c6174 100644
--- a/hidReader.ino
+++ b/hidReader.ino
@@ -71,8 +71,8 @@ void loop()
     // P: parity bit, F: facility code, C: card code
     // PFFFFFFFFCCCCCCCCCCCCCCCCP
     if (bitCount == 26) {
-      uint8_t facilityCode = (data >> 17);
-      uint16_t cardCode = (data >> 1);
+      uint8_t facilityCode = (data >> 17) & 0xFF;
+      uint16_t cardCode = (data >> 1) & 0xFFFF;
       // TODO: check parity bits
 
       Keyboard.print(facilityCode);