diff --git a/avr/comproto.asm b/avr/comproto.asm
index db077f5..321ddd4 100644
--- a/avr/comproto.asm
+++ b/avr/comproto.asm
@@ -385,6 +385,7 @@ CPRO_EnqueueDebug_error:
 CPRO_EnqueueValue:
   mov r6, r16
   mov r7, r17
+  mov r8, r18
   mov r9, r19
   mov r10, r20
   mov r11, r21