diff --git a/sys/src/9/port/devcons.c b/sys/src/9/port/devcons.c
index 53025dd5b..aacc64d3f 100644
--- a/sys/src/9/port/devcons.c
+++ b/sys/src/9/port/devcons.c
@@ -73,8 +73,7 @@ prflush(void)
  */
 struct {
 	Lock lk;
-//	char buf[16384];		/* normal */
-	char buf[256*1024];		/* for acpi debugging */
+	char buf[16384];
 	uint n;
 } kmesg;