diff --git a/client/loclass/cipher.c b/client/loclass/cipher.c
index 331e0b44e..76a3c1375 100644
--- a/client/loclass/cipher.c
+++ b/client/loclass/cipher.c
@@ -118,7 +118,7 @@ static uint8_t _select(bool x, bool y, uint8_t r) {
     uint8_t retval = 0;
     retval |= (z0 << 2) & 4;
     retval |= (z1 << 1) & 2;
-    retval |= z2 & 1;
+    retval |= (z2) & 1;
 
     // Return value 0 <= retval <= 7
     return retval;