diff --git a/avr/common/utils.asm b/avr/common/utils.asm
index 1b23778..81ef3ea 100644
--- a/avr/common/utils.asm
+++ b/avr/common/utils.asm
@@ -191,7 +191,7 @@ Utils_Fini:
 ; @param  X   pointer to SRAM to fill
 ; @param  r16 value to fill the SRAM with
 ; @param  r17 size of area to fill
-; @clobbers r17
+; @clobbers r17, X
 
 Utils_FillSram:
   tst r17