diff --git a/avr/modules/si7021/main.asm b/avr/modules/si7021/main.asm
index e6cd350..0ccc96e 100644
--- a/avr/modules/si7021/main.asm
+++ b/avr/modules/si7021/main.asm
@@ -285,6 +285,7 @@ si7021MeasureAny:
   pop r16
   brcc si7021MeasureAny_error
   rcall twiSendByteExpectAck               ; (R16, R17, R18, R22)
+  brcc si7021MeasureAny_error              ; no ACK or other error
 
   ldi r16, 200
   mov r14, r16