diff --git a/avr/si7021.asm b/avr/si7021.asm
index ea63882..6a387ee 100644
--- a/avr/si7021.asm
+++ b/avr/si7021.asm
@@ -165,6 +165,7 @@ si7021CheckPresence_notfound:
 
 
 
+#if 0
 ; ---------------------------------------------------------------------------
 ; si7021ReadFirmwareRevision
 ;
@@ -224,7 +225,7 @@ si7021ReadFirmwareRevision_error:
   rcall twiStop
   clc
   ret
-
+#endif
 
 
 ; ---------------------------------------------------------------------------