diff --git a/src/basic/init/initmsg_bytes_free.s b/src/basic/init/initmsg_bytes_free.s
index 59f8ef86..5ddf4ed6 100644
--- a/src/basic/init/initmsg_bytes_free.s
+++ b/src/basic/init/initmsg_bytes_free.s
@@ -29,7 +29,7 @@ initmsg_bytes_free:
 
 	sec			; Read, not write value
 	jsr JMEMTOP
-	cpx #$80
+	cpy #$80
 	beq @1
 !ifdef CONFIG_MEMORY_MODEL_60K {
 	lda #>$F7FF