diff --git a/src/cmd/internal/gc/builtin/runtime.go b/src/cmd/internal/gc/builtin/runtime.go
index ec769e1..179a4dd 100644
--- a/src/cmd/internal/gc/builtin/runtime.go
+++ b/src/cmd/internal/gc/builtin/runtime.go
@@ -108,7 +108,8 @@
 func chansend1(chanType *byte, hchan chan<- any, elem *any)
 func closechan(hchan any)
 
-// *byte is really *runtime.Type
+var writeBarrierEnabled bool
+
 func writebarrierptr(dst *any, src any)
 func writebarrierstring(dst *any, src any)
 func writebarrierslice(dst *any, src any)
@@ -144,6 +145,7 @@
 func writebarrierfat1110(dst *any, _ uintptr, src any)
 func writebarrierfat1111(dst *any, _ uintptr, src any)
 
+// *byte is really *runtime.Type
 func typedmemmove(typ *byte, dst *any, src *any)
 func typedslicecopy(typ *byte, dst any, src any) int